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Problem Solving Forum (636)

Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible or desirable?

Is there any method to take accurate wet film thickness readings when applying zinc rich primers?

What steps must be taken to mitigate poor adhesion over an existing aged silver aluminum paint? What primer will achieve good adhesion?

How does rapid depressurization affect lining performance in vessels and line pipe, and how can you identify any failure that might result?

What smartphone apps or online tools do you find useful in your job? How do they work, and how have they benefited you?

How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?

When a specification calls for removal of only loose coating rather than complete coating removal from a masonry substrate, what surface preparation methods are most likely to work without damaging the intact coating that is left on the surface?

Is grinding the only way to remove large areas of a silicone coating from a ship's hull to replace the silicone with an epoxy mastic?

When a specification calls for removal of only loose coating rather than complete coating removal from a masonry substrate, what surface preparation methods are most likely to work without damaging the intact coating that is left on the surface?

How does the concave or convex curvature of a surface affect the dry film thickness reading?

When moisture permeates concrete slabs or walls below grade, how can this problem be solved and does it require excavation?

Is there a list of the paint manufacturers who supply industrial-grade hexavalent chromium paint used by the aerospace industry?

How do admixtures to concrete (hardeners, anti-dust compounds, etc.) affect coating adhesion? What can be done to eliminate or minimize negative effects?

How does residue from chemical stripping affect the performance of the replacement coating?

What is the effect on the permeability of a coating when you add additional coats, either at the time of the original painting or as a maintenance activity?

I have several water tanks constructed with carbon steel for demineralized water storage. The tanks are about 20 years old, and the original coating has started to blister. For refurbishment of the coating, what material should be used and at what dry film thickness? The original type of coating is unknown.

How do you prepare an oil-stained, bare concrete floor for coating?

When planning containment for blasting, what are the most important factors to consider?

What kind of initial treatment is the best defense against graffiti for rough-surfaced concrete block (CMU)?

For coatings with a high-solids content (95% or more), what kinds of defects, such as holidays or micropores, are possible or likely to occur in the applied film? How can these be prevented or remedied?

What is the best way for me to assure I’m getting what I want when I specify a decorative finish such as glazing or gilding?

Can fluoropolymer coatings that are still very glossy be overcoated (if, for example, the topcoat is losing color or the color needs to be changed)? If so, what type of coating can be used, and what surface preparation is required?

What type of material should I use to achieve bright, bold colors on a concrete floor with heavy foot traffic?

How can I determine when concrete has cured sufficiently to be coated, besides waiting the 28 days typically specified?

How can you determine the moisture content of a concrete block (CMU) wall, and how can you judge when the moisture level is low enough to paint?

How do you accurately measure the adhesion of inorganic zinc?

RH probes are commonly used in concrete floors to determine moisture content. Can they be used in CMU walls or pre-cast walls?

Considering substitute power tool manual excess rust scale removal before abrasive blasting with HP / UHP water jetting. What could be recommended pressure / flow ratio for excess and poorly adherent material removal? I have limited water supply available (about 15-20 liters / minute). Abrasive blasting thereafter is a must because of the specification.

How can you determine if a concrete substrate is in suitable condition for application of an acid stain?

When we use field splice plate connections on structural steel projects, how do we prevent rust and rust staining at bolt heads and at the splice plate/steel interface?

How do I determine when a cementitious-based mortar used to repair exterior concrete is ready to be coated?

What type of antifouling or foul-release coating will provide the greatest protection in warm tropical waters, and for how long?

What smartphone apps or online tools do you find useful in your job? How do they work, and how do they help?

For st.2/st.3 prepared surfaces like luffing crane refurbishment in marine c5, environmental condition can extend warranties, or any standard guideline or in-meeting specific criteria warranty can be offered. Paint manufacturers sometimes do offer, but is there any set guideline for them?

Which factors are most important in selecting coatings for new concrete?

Zinc metalizing has been applied to concrete surfaces to provide cathodic protection to rebar in the concrete. What are the problems, if any, with applying zinc metalizing to concrete, and what is the best approach to addressing them?

What must specifiers consider when selecting and using sealants and grouts to fill gaps and seal concrete structures?

How do you determine if local water is suitable for use in UHP waterjetting, particularly in areas where potable water is scarce?

How do I get permanently get rid of efflorescence on clay brick?

Some painting specifications call for the use of “Best Effort” in relation to blasting. How does one determine “Best Effort?”

What are the essential books a Coating Inspector and/or foreman might want to have in his Library?

What are the pros and cons of using shotblasting to remove a coating system from a concrete floor?

Where there is likely to be ponding water, what generic type of reflective roof coating will work best and why?

Why would a pull-off adhesion test give a high value (no failure) for a solventless epoxy that later showed poor adhesion in service?

In what circumstances is third-party inspection justified on commercial coating work?

What do you do when the surface profile is higher than the dry film thickness of the specified primer?

When coating an aged concrete floor, how should one determine the correct sequence of surface preparation among the options of pressure washing and grinding or other concrete removal and roughening methods?

What makes a coating surface-tolerant?

What is the best way to prevent tropical hardwood deck lumber like ironwood from developing a gray patina in sunlight?

What percentage of deterioration is acceptable at a one-year warranty inspection of water tank linings before a contractor must repair the coating job?

When a specification requires Manufacturer X’s system “or equivalent,” what does “or equivalent” mean, and who decides what’s equivalent?

How many areas should be tested for possible chloride contamination during fabrication of an offshore production platform, and why?

How do you strip paint from a cementitious substrate if you can’t alter the surface texture?

What is the service life of a painted weathering steel bridge, compared to a painted carbon steel bridge in the same service environment?

If the walls of single-wythe CMU with core fill insulation become saturated, can they be adequately dried out for painting? If so, how?

When preparing to refurbish an old concrete secondary containment wall around a storage tank, what criteria should be used to determine if a crack can be repaired for coating or if the section of the wall should be rebuilt?

Is it cost-effective to grind steel edges before coating for atmospheric service? Why or why not?

How do you use smartphone apps on the job? What tasks or needs does your phone or tablet help with during the course of a day?

Can efflorescence be removed from integrally colored CMU without damaging the appearance? How?

If an owner is using thermal spray aluminum on a pipe exterior as corrosion protection under insulation, and there is a holiday in the coating, will corrosion be substantially accelerated at the base carbon steel, being that the steel is now anodic to the aluminum?

How do you determine the best type of staining to impart color and seal on a 30 to 40-year-old brick building being restored with some brick-faced additions?

What is the function of an air receiver during blasting?

What are the most important recommendations for ensuring success in field application of reflective roof coatings to aging single-ply roofs? Do these recommendations vary depending on whether the roof is EPDM, TPO, PVC, or some other type of substrate?

What is the best coating system to protect the hulls of floating production storage offloading units (FPSOs)?

What is best way to remedy over-thickness of a topcoat after it has dried and cured?

What is the best method for protecting cables on suspension bridges from corrosion?

On a parking deck with harsh exposures—to road salt, frequent wetting, freeze-thaw cycles, and exterior weathering—what generic coating type works best, and why?

What is the remedial action if a blaster produces too high a surface profile for the required primer thickness?

I’m converting a commercial space and am trying to decide on the floor. Should we polish the concrete floor or coat it? The concrete seems in fair shape, from what we can see under the dried mastic where the old vinyl tiles have been removed.

What are the best cycles to use in cyclic accelerated corrosion testing to achieve the highest correlation with atmospheric exposure in a northern, industrial environment?

How can I tell if my apartment building’s roof is suitable for installing a vegetative roof?

When should you specify UHP waterjetting on bridges?

How do you determine whether a lead-bearing coating can be overcoated or removed and replaced?

What can be done to prevent rust bleed in crevices when applying a zinc/epoxy/urethane system?

How do you adequately assess the adhesion of a newly applied coating?

I need to embed a metallized culvert liner on concrete. I've been told I have to paint it to avoid adhesion problems between the metal liner and the concrete. Is this true and, if so, what type of coating is best?

How is it possible to determine if concrete is sound enough to receive a thick-film coating?

What are the best options for coating steel and aluminum when encased in concrete below grade, to ensure long-term protection?

What kinds and sources of data are available to support the use of antimicrobial agents in coatings for hospital substrates?

What is the best method for preparing newly galvanized steel to be overcoated with an epoxy system?

I’ve heard about using crystalline admixture or crystalline materials on top of concrete to fill voids and make the substrate less permeable. When is this desirable, and what is the best way to use these materials?

What abrasive should be used to prepare stainless steel?

How do you determine the best type of paint to use when repainting a block or concrete building?

How do you overcoat an aged inorganic zinc coating?

How should a conflict between requirements, such as film thickness, on a product data sheet and the specification be resolved?

How can I determine the cleanliness of stainless steel for painting after blast cleaning?

In what types of climates and/or environments is the use of a vapor-impermeable air/moisture barrier recommended as opposed to a vapor-permeable system? Are there guidelines or standards that can help determine this?

When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the tool to the entire surface and when to use it just where the coating appears defective or rusting?

What is the clearest way to specify the degree of smoothness that you want to be achieved by surface preparation on an exterior wood substrate that is covered with deteriorated, uneven and built-up layers of paint?

Can glass abrasives be used for surface preparation of carbon steel in shipyards?

What would be an optimal coating system, in terms of both durability and productivity in field painting, for exposed structural steel on the exterior of a stadium built on the seacoast in a damp, cold environment?

What are some ways to improve transfer efficiency of airless spray application?

What is the best combination of metal (for instance, steel or aluminum) and coatings for creating bright colors on public art and sculpture, considering durability, initial cost, maintenance burden, resistance to vandalism, and gloss and color retention.

What environmental and safety precautions need to be taken when removing lead-based paint from the brick on a commercial building adjacent to the sidewalk in a dense urban business district when the removal method is chemical stripping followed by water blasting?

How much detail should be included in a specification for the surface preparation and painting of a parking garage exterior that includes tilt-up and structural concrete substrates?

What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?

Considering cost, productivity, and thoroughness, what is the best way to remove paint from cement blocks (CMUs)?

How can you justify the cost of installing an auto-blast machine and a paint booth in a fabricator's shop, and what resources are available to carry out such an analysis?

On a parking deck with harsh exposure conditions—from road salts, frequent wetting, and freeze-thaw cycles, to some exterior weathering—what generic type of film-forming coating works best and why?

When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the power tool to the entire surface and when to use it just where the coating appears to be defective or rusting?

What is the best way to remove graffiti from the surface of historic stone masonry on a church while preserving the appearance properties of the substrate?

How do you determine whether a lead-bearing coating can be overcoated or must be removed and replaced?

As a facility owner, how can I justify the cost of quality control measures, such as third-party inspection, to upper management in my company?

What confined-space rescue protocol (internal, third party, etc.) have you developed, and why did you choose this plan?

As a facility owner, how can I justify the cost of quality control measures, such as third-party inspection, to upper management in my company?

Which is the ideal test method (ASTM/ ISO) to test the flexibility of a lining product (organic coating) to be applied on concrete storage tanks to store brine water?

Do I need to pay attention to the permeability of the coating when specifying coatings for the exteriors of CMU walls?

What are the pros and cons of using an organic vs. inorganic zinc primer?

What is the clearest way to specify the degree of smoothness that you want to be achieved by surface preparation on an exterior wood substrate that is covered with deteriorated, uneven, and built-up layers of paint?

How do you account for the profile of blasted steel when taking a dry film thickness reading?

I've seen claims of extreme durability for a new concrete floor coating material exposed to heavy foot traffic. Is there a quick test to determine the validity of these claims?

There are ways to increase the pressure for waterjetting to levels above 20,000 psi. What are the effects of different pressures (below and above 20,000 psi) on cleaning ratios?

What is the best method for removing a day-glo orange spray graffiti from a brick wall?

What causes a persistent green/yellow hue on steel that has been exposed for a number of years in close proximity to the ocean, and how should the steel be prepared for painting?

What coating or lining system, including surface preparation, should be used on an in-ground swimming pool constructed of galvanized steel in a northern climate?

What is the best way to assure compliance with specified dry film coating thickness requirements on vertical concrete?

Can you provide recommendations on ways to make sure an acid stain can be successfully applied to an existing horizontal concrete surface? I understand that residues such as coatings, curing agents, waxes, or other materials will interfere with the stain’s reaction with the concrete, but can I find out what the substances are so I know how to remove them?

What are the alternatives for removing mildew from previously uncoated concrete block exteriors before coating?

How does abrasive recycling affect cleaning rates when steel is blast-cleaned in the field?

What is the best method of testing for moisture content in concrete masonry unit (CMU) walls prior to application of coatings?

What type of generic coating is required to protect the inside of a tank containing liquid with pH ranging from 2 to 13 and operated at 65-80 degrees Celsius? Why?

Do you need to wait for the mortar to cure before repainting a brick surface after repointing and power-tool cleaning? If so, how long, and how do you judge when it is safe?

How do you repair polyurea coatings?

What is the clearest way to specify the degree of smoothness required by surface preparation on an exterior wood substrate covered with deteriorated and uneven layers of paint?

Should 304 stainless steel pipework be coated prior to insulation?

What is the best way to protect an exposed concrete foundation?

What are the limitations of rust-encapsulating coatings?

What would be an optimal coating system, in terms of durability and productivity in field painting, for exposed structural steel on a stadium in a damp, cold environment?

Is there a place for using “rust convertors” in heavy-duty maintenance projects?

Is there a quick way to determine the validity of a claim of “extreme durability” for a new concrete floor coating material exposed to heavy foot traffic?

What type of generic coating is required to protect the inside of a tank containing liquid with pH ranging from 2 to 13 and operated at 65-80 degrees Celsius? Why?

Is it sufficient to specify simply that paint should be applied "according to the manufacturer’s instructions?" If not, what kind of detail should be included?

Should the surfaces of flanges be coated to prevent corrosion? Why or why not?

In what type of environment is the use of a vapor-impermeable air/moisture barrier recommended? Are there guidelines or standards to help determine this?

What is the effect of the wind-chill factor on the curing of epoxy and PU when temperatures are similar?

What is the best way to protect porous masonry from graffiti?

What is the best way to repair localized coating breakdown on steel?

The facade of my late-19th-century, cast-iron office building has been coated several times, most recently in the 1960s. The paint is faded and delaminating, and I want to remove and replace it. How do I assess the condition of the cast iron and coating, repair weakened areas of the cast iron and prepare and recoat the surface?

What causes amine blush in epoxy topcoats?

I am the facility manager for a new amusement park that will operate year-round in a hot, humid environment. Some critical structural steel in the heart of the park needs to be protected from corrosion and at the same time to retain very good appearance properties for as long as possible, since maintenance painting is disruptive. What coating system should I select to achieve the longest useful life, given that cost is a secondary consideration, and how long will this system look good while providing corrosion protection?

When performing maintenance surveys on structures that require coatings under insulation, how do you inspect the condition of the coatings?

What is the best way to prepare a horizontal concrete surface for successful application of an acid stain?

How do you properly coat welded joints?

What kind of treatment is the best defense against graffiti for rough-surfaced concrete block (CMU)?

What action should be taken if the IOZ fails the MEK test?

What should be considered in replacing a wooden deck with one made of concrete, in terms of the options for appearance, color and cost?

How should a contractor respond when he/she reads a specification requirement that "the nominal dry film thickness of the coating shall be 3 mils"?

When a food plant runs 24/7, even during coating maintenance, tiny airborne food particles can contaminate a prepared surface. How do you identify, prevent and/or remove such contamination before coating?

As an engineer in a moderate-sized operation, how can I justify the cost of third-party inspection to upper management?

Is there a definitive relationship between mechanical properties of coatings (such as elongation and tensile strength) and crack-bridging capability?

What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?

What is the best method of testing for moisture content in concrete masonry unit (CMU) walls before application of coatings?

What is the best way to remove thick-film elastomers from floors and ship decks?

Your field surface preparation requires SSPC SP-10 and your field bolting uses hot-dip galvanized bolts. What surface preparation do you require/allow on and around the bolts?

Does roller nap decrease the lifespan of a three-coat OZEU (organic zinc prime coat, an epoxy intermediate coat, and a urethane finish coat) paint system? Is there a visual guide or specification for this in the industry or test results available for study?

How do you best remove lubricants and other contaminants from field-bolted connections prior to painting?

In what circumstances is third-party inspection recommended for commercial coating work?

Is the MEK rub test a conclusive test to check the cure of IOZ coatings?

What is the best way to ensure successful application of an acid stain to an existing horizontal concrete surface?

I’m told that bond breakers and form release agents must be completely removed from newly placed concrete before coating. How is this best accomplished and verified?

What is the best combination of metal and coatings for creating bright colors on public art and sculpture, keeping in mind durability, cost, maintenance, and gloss and color retention?

Are there any industry standards, technical references, guidelines etc. that provide direction to an owner as to when a low-slope roof membrane (single ply, mechanically attached, white thermoplastic) should or MUST be replaced?

What is the correct procedure for carrying out preventive maintenance painting work in a small chemical product tank?

What is the most important factor to determine in a failure investigation and why is it so?

What type of material should I use to achieve bright, bold colors on a concrete floor that gets heavy foot traffic?

What criteria should an owner use to determine whether to specify full removal or spot- or zone-repair on a maintenance project?

What is a self-leveling floor coating, and are there any published standards such coatings must meet in terms of smoothness or other visual properties?

What is the best and quickest method for removing a polyurea tank lining?

How do I permanently get rid of efflorescence on clay brick?

What are the differences between calcium sulfonate modified alkyd (CSA) and high-ratio calcium sulfonate alkyd (HRCSA) in terms of performance and when and where each is used?

On guardrails on a marine wharf, grating panels consisting of mild steel bars about 1/8-inch by 1-inch on a 2-inch-square grid were painted with a three-coat zinc/epoxy/urethane system. Inspectors are finding numerous pinholes in the finish coat along the inside corners of the grating where the 1-inch-thick bars meet at a 90-degree angle. These pinholes were not noticed in the zinc or epoxy coats, but the final coat's visual inspection is more detailed. What is the likely cause of the pinholing, and what could be done to prevent it on future applications? Also, what should the disposition of the parts with pinholes be, as in, repair, accept as is, reblast and recoat, or an alternative?

What causes concrete “dusting,” and is there any way to prevent or remove it?

What are the pros and cons of acid-staining a concrete floor?

On a recent project, complex pre-fabricated, hot-dipped galvanized panels exhibited thicknesses in the range required for the entire subsequent coating system. It was not practical or possible to accurately map the thickness of the galvanizing across all the various parts, and DFT gauges available only measure the entire non-ferrous coating, including the galvanizing. How should thickness-per-coat minimums and maximums be controlled and verified for subsequent coatings?

What is the recommended coating system and procedure for repairing deteriorated inorganic zinc/epoxy/polyurethane 3-coat systems? Does the repair system or procedure vary with the degree of deterioration and if so, how?

What’s the best way to determine if a cementitious-based mortar used to repair exterior concrete is ready to be coated?

If an atmospheric coating system of a zinc-rich epoxy, epoxy mid coat and polyurethane color topcoat has properly cured with no visual defects, should I be worried if the thickness of any coat exceeds any specified maximum?

I need to remove coatings from masonry on a historic-preservation project. What are my options for doing so without damaging the mortar joints?

What is the difference between a damp-surface tolerant and a wet-surface tolerant paint? How can we determine when a surface is damp or wet?

We’re converting a grocery store into a motorcycle dealership. Should we polish the concrete floor or coat it? The concrete seems in fair shape, from what we can see under the dried mastic where the old vinyl tiles have been removed.

Alternatives to coal tar epoxies in wastewater/sewage applications have been in service for a number of years. From experience, which coating types with what fillers at what thicknesses (over steel) have performed best?

During a week of heavy rain, we painted the interior of a heated concrete building. The paint blistered badly a week later on the walls with an outside exposure. What’s the best way to remove the coating, prepare the surface, and recoat to prevent future blistering?

What type of coating system (and surface prep) should be used to protect a steel factory roof that is subject to hydrochloric acid vapors and other industrial pollutants and particulates in a hot, humid environment?

Washing with potable water is used to reduce the soluble salt level on steel. However, such water contains low levels of various salts that will deposit on the surface as the water dries. At what point does washing deposit more salt than it removes?

How does a lower-metallic-content zinc-rich epoxy affect the life of a paint system?

What should be included in the risk assessment of a particular painting project?

Is a sealer coat always required for coating systems applied to concrete surfaces that will be exposed to marine environments?

What is the optimal moisture content for masonry before painting can begin?

Under what types of exterior atmospheric exposures (other than marine) is it necessary to test for soluble salts?

How do you know when pot life has expired? Can you extend pot life and, if so, how?

Under what conditions should small-diameter blisters (<1.5 inches) in a water tank lining be repaired/repainted? Should the blisters be broken and the substrate examined?

What factors would justify coating stainless steel in water or wastewater service? What standards and methods apply?

What is the best way to prevent corrosion of reinforcing bar in concrete?

For a one-coat inorganic zinc silicate painting system, what is the best method for touch-up and repair?

When is it necessary to install sealant between the base of building walls and concrete sidewalks or pavement to prevent moisture from wicking up the wall? How does the climate affect this decision?

What errors are most likely to occur when measuring dry film thickness on steel, and how can I avoid them?

How do you determine the best type of coating for repainting a block or concrete building?

Are there any advantages in applying a protective coating over a hot-dipped galvanized surface?

When and why would I need to stripe coat if I am using an edge-retention primer?

Should you paint the stainless steel outfitting (ladders, supports, etc.) in steel cargo tanks of chemical tankers?

When applying a 100% solids, fast-curing polyurea coating on concrete, what is the best method for verifying that the proper thickness has been applied?

Where are errors most likely to occur when measuring dry film thickness on steel, and how can they be avoided?

Are there special primers and surface preparation requirements for painting unpainted aluminum?

What tests and criteria can a coatings user specify to assure consistent lot-to-lot performance of supplied coatings?

What are the criteria for selecting coatings for application during extreme (atmospheric) heat?

In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion (MIC)?

What is an acceptable level of moisture in concrete walls before painting with an acrylic system, and how should the moisture level be measured?

Where would you use epoxy and cementitious intumescent coatings?

Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible?

What advantages/disadvantages have you seen with using recycled glass abrasives vs. traditional abrasives?

What are the pros and cons of specifying sieve sizes for abrasives?

We need to paint our publicly owned lighthouse. What should I include in the specifications for this bid regarding surface preparation, coating systems, and other considerations?

When a specification calls for removing only loose coating from a masonry substrate, what methods are effective without damaging the intact coating that is left on the surface?

When using the Bresle method to determine level of salt contamination, why do ISO 8502-9 and IMO PSPC use different constants to covert the conductivity measured (micro Siemens/cm) to total salt density (mg/m2)?

What are the common moisture tests for vertical, below-grade concrete structures scheduled to receive a high-build, protective lining system?

Can a cross-cut adhesion test be carried out on IOZ coatings?

How do you assess salts and other non-visible contaminants on concrete surfaces?

What coating problems are likely in storage tanks that have dissimilar metal sides and floors?

What kind of coating system provides the strongest resistance to staining from hot tires on garage floors and parking decks?

How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?

How do you assess vertical concrete surface pH after surface preparation of existing concrete?

In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion?

Can lightweight block (CMU) be successfully coated to prevent water intrusion, or is it best to build with standard weight?

What is the most common or economical coating system for rehabbing the exterior of above-ground storage tanks?

What should be considered in replacing a wooden deck with one made of concrete, in terms of the options for appearance, color, cost? I've seen articles about stains, integral coloring, and other decorative treatments, as well as lighter-weight concrete, but it's not easy to compare and judge the options.

Is there any problem measuring the DFT of an MIO coating using an electromagnetic induction gauge?

What criteria should be used in deciding between a liquid-applied and a sheet-applied air barrier?

What are the performance distinctions among various types of intumescent coatings (for example, water-based, solvent-based, epoxies and methacrylates)?

What are the most effective procedures for protecting steel and adjacent concrete?

Which single type of paint system can be used to protect both stainless steel and carbon steel welded together?

Is it practical to use black light to check for dirt or other foreign matter during surface preparation inspection?

How can I tell if my apartment building’s roof is suitable for installing a vegetative roof?

What are the reasons for different dew points from a sling psychrometer and a digital dew point meter at the same site, and what should be done?

What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?

What’s the best way to protect a masonry wall from freeze/thaw cycling?

How do you determine whether a lead-bearing coating can be overcoated or removed and replaced?

What’s the best way to protect porous masonry from graffiti?

What are the differences between an ethyl silicate base zinc-rich primer and an alkali silicate base zinc-rich primer? In what instances should one be used instead another?

Do the balcony floor slabs on the high-rise seaside condo I’m working on in Florida really need cathodic protection?

We are restricted to applying road marking paints during hot, humid summer nights, on surfaces very often below dew point conditions. What is the best generic type of marking paint to use?

How do I clean off mortar smears that were allowed to cure for six months on a new architectural block building?

At what percentage of relative humidity and temperature, is amine blush likely to occur?

Theoretically, how many LEED credits can be acquired for a newly constructed building through the use of coatings and related technologies, such as diamond-polished concrete?

How do I deal with the small cracks and fractures that occur along the edges and corners of the stone imprints in some of my stamped concrete work?

How long can a blasted surface be left before priming under different temperatures/relative humidity environments?

Zinc metalizing has been applied to concrete surfaces to provide cathodic protection to rebar in the concrete. What are the problems, if any, with applying zinc metalizing to concrete, and what is the best approach to addressing them?

What is the difference between the coalescence mechanism and the solvent evaporation mechanism regarding the paint film formation?

How does the concave or convex curvature of a surface affect a coating's shore hardness reading?

How do I minimize corrosion at the splash zone on sheet pile and piping in brackish water?

How do you gauge the remaining service life of a weathered alkyd paint system and determine whether it should be removed or overcoated?

How can active corrosion be determined on a live pipeline?

For coatings with a high-solids content (95% or more), what kinds of defects, such as holidays or micropores, are possible or likely to occur in the applied film? How can these be prevented or remedied?

How do you determine if local water is suitable for use in UHP waterjetting, particularly in areas where potable water is scarce?

How does the concave or convex curvature of a surface affect the WFT reading?

If a paint data sheet notes a required primer thickness of 125 microns, but the project specification calls for 50 microns, how is this resolved?

During newbuilding, do I have to stripe coat edges if I am using an edge retention primer?

Some painting specifications call for the use of “Best Effort” in relation to blasting. How does one determine “Best Effort?”

RH probes are commonly used in concrete floors to determine moisture content. Can they be used in CMU walls or pre-cast walls?

What measures must you take to determine and assure the cleanliness of an abrasive?

What causes bubbling or cratering of epoxy intermediate coat when applied over epoxy zinc-rich primer?

When the relative humidity in a paint shop exceeds 80%, how can you apply waterborne inorganic zinc so that it cures sufficiently for topcoating in a reasonable time?

When performing maintenance painting of tank coatings, what are the pros and cons of overcoating an existing lining that appears to be in good condition?

If the walls of single-wythe CMU with core fill insulation become saturated, can they be adequately dried out for painting? If so, how?

How do you strip paint from a cementitious substrate if you can’t alter the surface texture?

What is the service life of a painted weathering steel bridge, compared to a painted carbon steel bridge in the same service environment?

When preparing to refurbish an old concrete secondary containment wall around a storage tank, what criteria should be used to determine if a crack can be repaired for coating or if the section of the wall should be rebuilt?

Is it cost-effective to grind steel edges before coating for atmospheric service? Why or why not?

When preparing to refurbish an old concrete secondary containment wall around a storage tank, what criteria should be used to determine if a crack can be repaired for coating or if the section of the wall should be rebuilt?

Can efflorescence be removed from integrally colored CMU without damaging the appearance? How?

Some specifications may have requirements that the inspector may know to be extraneous or may be more restrictive than necessary to obtain a quality coating application. What is the ethical responsibility of the inspector to reject non-conforming coatings that they know will perform as intended, particularly where attempted repairs may degrade the coating system?

What types of measures can be taken on or around metal pipes or columns that penetrate concrete or asphalt paving to reduce corrosion at the interface?

How do you measure the DFT or WFT of a film-forming sealer applied to a metallized coating (e.g., flame-sprayed zinc)?

When is it cost-effective to use thermal spray in petrochemical facilities?

How many times can a building be repainted before the paint becomes too thick to perform properly?

What are the performance distinctions among various types of intumescent coatings (for example, water-based, solvent based, epoxies, methacrylates, etc.)?

Which generic coating systems are suitable for protecting pipeline internals carrying highly abrasive media?

From a specifier’s point of view, what are the important distinctions between various products that are classified as polyurea?

What can be done to prevent rust bleed in crevices when applying a zinc/epoxy/urethane system?

When should you specify UHP waterjetting on bridges?

What is the proper surface preparation for stainless steel before coating to resist a salt-laden atmosphere?

Which factors are most important in selecting coatings for new concrete?

Why are zinc-rich paints generally not used for an immersion environment, despite the superior anti-corrosive protection?

Is it necessary to holiday test the interior lining in the vapor phase (roof) of water storage tanks after coating?

What must specifiers consider when selecting and using sealants and grouts to fill gaps and seal concrete structures?

When blasting cast-iron structural steelwork, what type of defects might be found, and how do you address them?

How do you successfully apply a chemical-resistant lining to the interior of small-diameter pipes (3 inches or less)?

Which lining systems are suitable for the maintenance painting of an mono ethylene glycol storage tank protection?

In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion?

What are the most effective procedures for protecting steel and adjacent concrete together?

What are the options for shop-applied systems (surface preparation and coating type) to protect the interiors and exteriors of new saltwater storage tanks and associated steelwork that will be exposed to seawater, and that will allow for easy touchup and maintenance once the structures are erected?

How do you adequately assess the adhesion of a newly applied coating?

What is the remedial action if a blaster produces too high a surface profile for the required primer thickness?

What is the best method for preparing newly galvanized steel to be overcoated with an epoxy system?

What are the best cycles to use in cyclic accelerated corrosion testing to achieve the highest correlation with atmospheric exposure in a northern, industrial environment?

I need to embed a metallized culvert liner on concrete. I've been told I have to paint it to avoid adhesion problems between the metal liner and the concrete. Is this true and, if so, what type of coating is best?

How should a conflict between requirements, such as film thickness, on a product data sheet and the specification be resolved?

How can you determine if a concrete substrate is in suitable condition for application of an acid stain?

What is the preferred method to remove 25-year-old coal tar epoxy from a carbon steel tank in order to reline?

I’ve heard about using crystalline admixture or crystalline materials on top of concrete to fill voids and make the substrate less permeable. When is this desirable, and what is the best way to use these materials?

What percentage of deterioration is acceptable at a one-year warranty inspection of water tank linings before a contractor must repair the coating job?

What smartphone apps or online tools do you find useful in your job? How do they work, and how do they help?

How clean must the compressed-air supply be for blast cleaning, blow down and painting? How is cleanliness of the air determined?

What is best way to remedy over-thickness of a topcoat after it has dried and cured?

When implementing an in-plant, exterior exposure, or accelerated testing program for coatings, should the test panels be scribed? Why?

How is it possible to determine if concrete is sound enough to receive a thick-film coating?

How do you measure wet film thickness on shop-applied organic zinc-rich primers to accurately predict dry film thickness?

What components of an onshore shale gas drilling rig require coating protection, and what properties must the coatings have?

What is the definition of a hybrid coating, and what are the performance properties of hybrid coatings?

The first step of using replica tape to measure surface profile (i.e ISO 8503-5) is choosing the right tape e.g Coarse and X-Coarse. But without any data about blasting surface, how we can choose the right replica tape corresponding to the surface profile?

What is the best way to prevent tropical hardwood deck lumber like ironwood from developing a gray patina in sunlight?

In reviewing the testing data for adhesion, some manufacturers indicate ASTM D4541 results while others show ASTM C3359 results. Is it possible to compare one against the other? For example, does 1037 psi provide better adhesion than 4A?

How can you safely remove a polyurea coating? As blasting is not possible, is there a chemical removal method?

In a northern climate with extreme winters, is it reasonable to consider retrofitting an air barrier to a multi-unit brick apartment building? What sort of installation strategy would be most beneficial?

How can you determine the moisture content of a concrete block (CMU) wall, and how can you judge when the moisture level is sufficiently low to paint?

The literature indicates that UHP waterjetting does produce a profile on steel, although of a micro nature. Is this sufficient roughness for good adhesion of thin film primers (e.g. < 2 mils dft)?

How do you repair delaminated areas of an elastomeric polyurea when the majority of the coating system is intact?

What is the best way for me to assure I'm getting what I want when I specify a decorative finish such as glazing or gilding?

Do you need to wait for the mortar to cure before repainting a brick surface after repointing and power-tool cleaning to remove loosely adhered coating material from a previous paint job? If so, how long, and is there a way to judge when it is safe?

When we use field splice plate connections on structural steel projects, how do we prevent rust and rust staining at bolt heads and at the splice plate/steel interface?

What generic types of coatings work best as liquid-applied air barriers, considering both cost and effectiveness, and what should be the dry film thickness of this system?

What are the benefits and risks of using holiday testing on mat-reinforced, thermoset linings (over a conductive primer) on concrete substrates intended for immersion service? Should other tests be performed with or instead of holiday testing?

What are the pros and cons of using shotblasting to remove a coating system from a concrete floor?

What are the significant differences in performance between an inorganic zinc primer (ethyl silicate) and an organic zinc primer (epoxy), given the same application and exposure conditions?

ASTM A780 says zinc-rich paints for repairing hot-dip galvanized damage must contain either between 65-69% metallic zinc by weight or greater than 92% metallic zinc by weight in dry film. Why is only 65-69% or above 92% accepted? Is any zinc-rich paint out of these ranges not suitable for HDG repair?

Where there is likely to be ponding water, what generic type of reflective roof coating will work best and why?

I keep reading references to sweep blasting, but I can't find a standard for it. What is sweep blasting, and is there a standard for it in the U.S. or elsewhere?

Considering cost, productivity, and thoroughness, what is the best way to remove paint from cement blocks (CMUs)?

How can you justify the cost of installing an auto-blast machine and a paint booth in a fabricator's shop, and what resources are available to carry out such an analysis?

When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the power tool to the entire surface and when to use it just where the coating appears to be defective or rusting?

What is the clearest way to specify the degree of smoothness that you want to be achieved by surface preparation on an exterior wood substrate that is covered with deteriorated, uneven and built-up layers of paint?

I've seen claims of extreme durability for a new concrete floor coating material exposed to heavy foot traffic. Is there a quick test to determine the validity of these claims?

If I apply 140 microns of inorganic zinc to a steel substrate with a 75 micron profile, is there any concern about cracking of the primer during storage, shipment, and erection of the structure, or with field-application of a topcoat?

What is the best method for removing a day-glo orange spray graffiti from a brick wall?

How do you determine the size of the dehumidification equipment required for a tank lining project?

A specification for a bridge to be built of high-performance weathering steel (HPS GR50/GR70W) requires an SSPC-SP 10, a profile of 3 to 5 mils, and metallizing with a final dft of 10-12 mils. What challenges, time, and costs are associated with obtaining the profile, primarily in the shop but also in the field? Are there any long-term performance issues with metallizing over weathering steel?

What is the best way to judge the effectiveness and durability of competing liquid-applied air barriers on concrete block?

What environmental and safety precautions must be taken when using chemical stripping and water blasting to remove lead-based paint from a commercial building exterior in an urban business district?

What is the best way to achieve proper surface preparation in areas with limited access, such as interior box beams on bridges?

How do you determine if steel shot or grit for centrifugal/wheel blasting need to be replaced?

When a food plant runs 24/7, even during coating maintenance, tiny airborne food particles can contaminate a prepared surface. How do you identify, prevent and/or remove such contamination before coating?

What environmental and safety precautions need to be taken when removing lead-based paint from the brick on a commercial building adjacent to the sidewalk in a dense urban business district when the removal method is chemical stripping followed by water blasting?

What is the best method of testing for moisture content in concrete masonry unit (CMU) walls before application of coatings?

What should be considered in replacing a wooden deck with one made of concrete, in terms of the options for appearance, color and cost?

During a week of heavy rain, we painted the interior walls of a heated concrete building. On the interior of walls that had an outside exposure, the paint blistered badly a week after the rain subsided. Could the rain have caused the blistering and, if so, how?

I understand that the EPA is reluctant to allow the use of nanoparticles in coatings, due to their tendency to persist in the environment. What is the real risk, and how can the nanocoating industry address it?

What tests and criteria can a coatings user specify to assure consistent lot-to-lot performance of supplied coatings?

Where are errors most likely to occur when measuring dry film thickness on steel, and how can they be avoided?

Why would a pull-off adhesion test give a high value (no failure) for a solventless epoxy that later showed poor adhesion in service?

How does concave or convex curvature of a surface affect the WFT reading?

How can it be determined if moisture within a CMU wall is causing repeated coating failure? If so, can the source of moisture entry be accurately identified for correction?

As an engineer in a moderate-sized chemical plant, how can I justify the cost of third-party inspection to upper management?

Is stainless steel banding suitable for fixing galvanized insulation cladding? If not, why not?

What is the best method for removing production machine oils soaked deeply into a concrete floor before applying a non-skid coating?

As a facility owner, how can I justify the cost of quality control measures, such as third-party inspection, to upper management in my company?

When applying a 100% solids, fast-curing polyurea coating on concrete, what is the best method for verifying that the proper thickness has been applied?

What is an acceptable level of moisture in concrete walls before painting with an acrylic system, and how is the moisture level measured?

Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible or desirable?

What steps must be taken to mitigate poor adhesion over an existing aged silver aluminum paint? What primer will achieve good adhesion?

How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?

What smartphone apps or online tools do you find useful in your job? How do they work, and how have they benefited you?

When a specification calls for removal of only loose coating rather than complete coating removal from a masonry substrate, what surface preparation methods are most likely to work without damaging the intact coating that is left on the surface?

A specification requires Manufacturer X’s system “or equivalent.” What does “or equivalent” mean, and who decides what’s “equivalent?”

When specifying coatings for maintenance repainting of structural steel, under what conditions is it acceptable to settle for a surface-tolerant system, and when is such a system unacceptable?

When moisture permeates concrete slabs or walls below grade, how can this problem be solved and does it require excavation?

How do admixtures to concrete (hardeners, anti-dust compounds, etc.) affect coating adhesion? What can be done to eliminate or minimize negative effects?

What is the effect on the permeability of a coating when you add additional coats, either at the time of the original painting or as a maintenance activity?

How does residue from chemical stripping affect the performance of the replacement coating?

I have several water tanks constructed with carbon steel for demineralized water storage. The tanks are about 20 years old, and the original coating has started to blister. For refurbishment of the coating, what material should be used and at what dry film thickness? The original type of coating is unknown.

What is the maximum number of holidays that should be permitted for linings used in immersion service, and why?

What is the Cold Wall Effect? Can it cause premature coating failure and, if so, how do I prevent or minimize it?

Do I need to pay attention to the permeability of the coating when specifying coatings for the exteriors of CMU walls?

How much detail should be included in a specification for the surface preparation and painting of a parking garage exterior that includes tilt-up and structural concrete substrates?

How much detail should be included in a specification for the surface preparation and painting of a parking garage exterior that includes tilt-up and structural concrete substrates?

How should a contractor respond when he reads a specification requirement that "the nominal dry film thickness of the coating shall be 3 mils"?

What are some ways to improve transfer efficiency of airless spray application?

In what types of climates and/or environments is the use of a vapor-impermeable air/moisture barrier recommended as opposed to a vapor-permeable system? Are there guidelines or standards that can help determine this?

What is the clearest way to specify the degree of smoothness that you want to be achieved by surface preparation on an exterior wood substrate that is covered with deteriorated, uneven and built-up layers of paint?

What would be an optimal coating system, in terms of both durability and productivity in field painting, for exposed structural steel on the exterior of a stadium built on the seacoast in a damp, cold environment?

What type of coating system (and surface prep) should be used to protect a steel factory roof that is subject to hydrochloric acid vapors and other industrial pollutants and particulates in a hot, humid environment?

What is the best combination of metal (for instance, steel or aluminum) and coatings for creating bright colors on public art and sculpture, considering durability, initial cost, maintenance burden, resistance to vandalism, and gloss and color retention.

What are the most important recommendations for ensuring success in field application of reflective roof coatings to aging single-ply roofs? Do these recommendations vary depending on whether the roof is EPDM, TPO, PVC, or some other type of substrate?

What type of material should I use to achieve bright, bold colors on a concrete floor with heavy foot traffic?

Can water be sprayed onto an IOZ coated surface, which has not fully cured due to low humid conditions, to accelerate the cure?

How do I determine when a cementitious-based mortar used to repair exterior concrete is ready to be coated?

Under what conditions should stainless steel be painted in the oil and gas industry?

The facade of my late-19th-century, cast-iron office building has been coated several times, most recently in the 1960s. The paint is faded and delaminating, and I want to remove and replace it. How do I assess the condition of the cast iron and coating, repair weakened areas of the cast iron and prepare and recoat the surface?

When a food plant runs 24/7 even during coating maintenance, tiny food particles floating in the air (e.g., sugar from sugar processing) in the plant can contaminate a prepared surface. How do you prevent such contamination, or identify it and remove it before applying the coating?

What is the best way to judge the effectiveness of competing products offered as liquid-applied air barriers on concrete block, in terms of both durability and air barrier properties?

What kind of surface preparation prior to coating will be effective and at the same time economical for the aluminum window frames on a large commercial office building? The aluminum was coated originally with a baked-on fluoropolymer which has lost most of its gloss. Maintenance recoating will be with an air-dry fluoropolymer.

What coating or lining system, including surface preparation, should be used on an in-gound swimming pool constructed of galvanized steel in a northern climate?

Your field surface preparation requires SSPC SP-10 and your field bolting uses hot-dip galvanized bolts. What surface preparation do you require/allow on and around the bolts?

Can you provide recommendations on ways to make sure an acid stain can be successfully applied to an existing horizontal concrete surface? I understand that residues such as coatings, curing agents, waxes, or other materials will interfere with the stain’s reaction with the concrete, but can I find out what the substances are so I know how to remove them?

What are the alternatives for removing mildew from previously uncoated concrete block exteriors before coating?

What is the best method of testing for moisture content in concrete masonry unit (CMU) walls prior to application of coatings?

Is there a definitive relationship between mechanical properties of coatings (such as elongation and tensile strength) and crack-bridging capability?

What is the difference between a damp-surface tolerant and a wet-surface tolerant paint? How can we determine when a surface is damp or wet?

A specification for a bridge to be built of high-performance weathering steel requires an SSPC-SP 10, a profile of 3 to 5 mils, and metallizing with a final DFT of 10-12 mils. What challenges, time, and costs are associated with obtaining the profile?

During a week of heavy rain, we painted the interior of a heated concrete building. The paint blistered badly a week later on the walls with an outside exposure. What’s the best way to remove the coating, prepare the surface, and recoat to prevent future blistering?

Is it cost-effective to grind steel edges before coating for atmospheric service? Why or why not?

What is the best way to repair localized coating breakdown on steel?

What causes blistering/crater formation in freshly applied polyurethane topcoats, and how can this be avoided?

Which is the most reliable technique to determine pot life of two component paints?

What’s the best way to prevent corrosion of reinforcing bar in concrete?

What is the proper surface preparation for stainless steel before coating to resist a salt-laden atmosphere?

What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?

How does a lower-metallic-content zinc-rich epoxy affect the life of a paint system?

What pluses and minuses have you seen with using recycled-glass abrasives vs. traditional abrasives?

How do you determine the best type of coating for repainting a block or concrete building?

What are the performance distinctions among various types of intumescent coatings (for example, water-based, solvent-based, epoxies and methacrylates)?

What are the most effective procedures for protecting steel and adjacent concrete?

How pure must fresh water be for water washing or waterjetting, and how do you determine the water’s purity?

How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?

Which factors are most important in selecting coatings for new concrete?

Some painting specifications call for the use of “Best Effort” in relation to blasting. How does one determine “Best Effort?”

What must specifiers consider when selecting and using sealants and grouts to fill gaps and seal concrete structures?

What are the criteria for selecting coatings for application during extreme (atmospheric) heat?

How do you determine whether a lead-bearing coating can be overcoated or removed and replaced?

How do you adequately assess the adhesion of a newly applied coating?

What is an acceptable level of moisture in concrete walls before painting with an acrylic system, and how should the moisture level be measured?

Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible?

How do you know when pot life has expired? Can you extend pot life and, if so, how?

How should a conflict between requirements, such as film thickness, on a product data sheet and the specification be resolved?

How can I determine the cleanliness of stainless steel for painting after blast cleaning?

We need to paint our publicly owned lighthouse. What should I include in the specifications for this bid regarding surface preparation, coating systems, and other considerations?

What is best way to remedy over-thickness of a topcoat after it has dried and cured?

When a specification requires Manufacturer X’s system “or equivalent,” what does “or equivalent” mean, and who decides what’s equivalent?

On a parking deck with harsh exposures—to road salt, frequent wetting, freeze-thaw cycles, and exterior weathering—what generic coating type works best, and why?

What criteria should be used in deciding between a liquid-applied and a sheet-applied air barrier?

How can I determine if my urban hospital building would benefit financially by installing a reflective roof coating on top of the current flat black roofing substrate?

How do I get permanently get rid of efflorescence on clay brick?

What causes concrete “dusting,” and is there any way to prevent or remove it?

I need to remove coatings from masonry on a historic-preservation project. What are my options for doing so without damaging the mortar joints?

I’m converting a commercial space and am trying to decide on the floor. Should we polish the concrete floor or coat it? The concrete seems in fair shape, from what we can see under the dried mastic where the old vinyl tiles have been removed.

How can I tell if my apartment building’s roof is suitable for installing a vegetative roof?

What’s the best way to protect a masonry wall from freeze/thaw cycling?

What’s the best way to protect porous masonry from graffiti?

Do the balcony floor slabs on the high-rise seaside condo I’m working on in Florida really need cathodic protection?

How do I clean off mortar smears that were allowed to cure for six months on a new architectural block building?

What is the best way to protect an exposed concrete foundation?

What is the best way to protect an exposed concrete foundation?

What errors are most likely to occur when measuring dry film thickness on steel, and how can I avoid them?

RH probes are commonly used in concrete floors to determine moisture content. Can they be used in CMU walls or pre-cast walls?

If the walls of single-wythe CMU with core fill insulation become saturated, can they be adequately dried out for painting? If so, how?

ASTM International announced it would develop a proposed standard for fiber-reinforced concrete to give the engineering community the data needed to measure tensile strength. While it was reported that the use of fiber reinforcement has been “limited,” do you believe fiber-reinforced concrete will become more widely used in the construction industry within the next decade?

What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?

How do you strip paint from a cementitious substrate if you can’t alter the surface texture?

Can efflorescence be removed from integrally colored CMU without damaging the appearance? How?

What is the optimal moisture content for masonry before painting can begin?

How do you determine the best type of paint to use when repainting a block or concrete building?

How is it possible to determine if concrete is sound enough to receive a thick-film coating?

What is the definition of a hybrid coating, and what are the performance properties of hybrid coatings?

How can you determine the moisture content of a concrete block (CMU) wall, and how can you judge when the moisture level is sufficiently low to paint?

Do you need to wait for the mortar to cure before repainting a brick surface after repointing and power-tool cleaning to remove loosely adhered coating material from a previous paint job? If so, how long, and is there a way to judge when it is safe?

Theoretically, how many LEED credits can be acquired for a newly constructed building through the use of coatings and related technologies, such as diamond-polished concrete?

On a parking deck with harsh exposure conditions—from road salts, frequent wetting, and freeze-thaw cycles, to some exterior weathering—what generic type of film-forming coating works best and why?

Do you need to wait for the mortar to cure before repainting a brick surface after repointing and power-tool cleaning? If so, how long, and how do you judge when it is safe?

What is the best way to remove graffiti from the surface of historic stone masonry on a church while preserving the appearance properties of the substrate?

As a facility owner, how can I justify the cost of quality control measures, such as third-party inspection, to upper management in my company?

Do I need to pay attention to the permeability of the coating when specifying coatings for the exteriors of CMU walls?

How much detail should be included in a specification for the surface preparation and painting of a parking garage exterior that includes tilt-up and structural concrete substrates?

What is the clearest way to specify the degree of smoothness that you want to be achieved by surface preparation on an exterior wood substrate that is covered with deteriorated, uneven, and built-up layers of paint?

I've seen claims of extreme durability for a new concrete floor coating material exposed to heavy foot traffic. Is there a quick test to determine the validity of these claims?

What is the best method for removing a day-glo orange spray graffiti from a brick wall?

What causes a persistent green/yellow hue on steel that has been exposed for a number of years in close proximity to the ocean, and how should the steel be prepared for painting?

What environmental and safety precautions need to be taken when removing lead-based paint from the brick on a commercial building adjacent to the sidewalk in a dense urban business district when the removal method is chemical stripping followed by water blasting?

What are the performance distinctions among various types of intumescent coatings? More specifically, the differences between water-based, solvent-based, epoxies and methacrylates?

What is the best combination of metal (for instance, steel or aluminum) and coatings for creating bright colors on public art and sculpture, considering durability, initial cost, maintenance burden, gloss, color retention and resistance to vandalism.

What are the alternatives for removing mildew from uncoated concrete block exteriors before coating?

What is the best way to judge the effectiveness of competing products offered as liquid-applied air barriers on concrete block, in terms of both durability and air barrier properties?

What should be considered in replacing a wooden deck with one made of concrete, in terms of the options for appearance, color, cost?

How do I deal with the small cracks and fractures that occur along the edges and corners of the stone imprints in some of my stamped concrete work?

How do you keep sealants in control joints from cracking or separating from the substrate?

Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible?

What types of measures can be taken on or around metal pipes or columns that penetrate concrete or asphalt paving to reduce corrosion at the interface?

When is it necessary to install sealant between the base of building walls and concrete sidewalks or pavement to prevent moisture from wicking up the wall? How does the climate affect this decision?

How many times can a building be repainted before the paint becomes too thick to perform properly?

In a northern climate with extreme winters, is it reasonable to consider retrofitting an air barrier to a multi-unit brick apartment building? What sort of installation strategy would be most beneficial?

What is the effect on the permeability of a coating when you add additional coats, either at the time of the original painting or as a maintenance activity?

What type of material should I use to achieve bright, bold colors that will last on a concrete floor with heavy foot traffic?

In what circumstances is third-party inspection justified on commercial coating work?

I am the facility manager for a new amusement park that will operate year-round in a hot, humid environment. Some critical structural steel in the heart of the park needs to be protected from corrosion and at the same time to retain very good appearance properties for as long as possible, since maintenance painting is disruptive. What coating system should I select to achieve the longest useful life, given that cost is a secondary consideration, and how long will this system look good while providing corrosion protection?

What kind of surface preparation prior to coating will be effective and at the same time economical for the aluminum window frames on a large commercial office building? The aluminum was coated originally with a baked-on fluoropolymer which has lost most of its gloss. Maintenance recoating will be with an air-dry fluoropolymer.

What is the best method of testing for moisture content in concrete masonry unit (CMU) walls prior to application of coatings?

What criteria of selection should be used in deciding between a liquid-applied and a sheet-applied air barrier?

Can an epoxy polyamide zinc phosphate primer be overcoated with a synthetic enamel alkyd-based topcoat? If no, why not?

What type of generic coating is required to protect the inside of a tank containing liquid with pH ranging from 2 to 13 and operated at 65-80 degrees Celsius? Why?

Should the surfaces of flanges be coated to prevent corrosion? Why or why not?

What is the effect of the wind-chill factor on the curing of epoxy and PU when temperatures are similar?

How do you repair polyurea coatings?

What is the maximum temperature that an epoxy powder coating can resist when applied on steel substrate?

Should 304 stainless steel pipework be coated prior to insulation?

What are the limitations of rust-encapsulating coatings?

What causes blistering/crater formation in freshly applied polyurethane topcoats, and how can this be avoided?

What is most effective treatment for steel contaminated with MIC before painting?

How do you properly coat welded joints?

What is the best way to repair localized coating breakdown on steel?

What is the best way to remove thick-film elastomers from floors and ship decks?

What is the best way to remove thick-film elastomers from floors and ship decks?

What action should be taken if the IOZ fails the MEK test?

What is best media to use to remove aged epoxy coal tar from a steel tank before re-lining?

Does roller nap decrease the lifespan of a three-coat OZEU (organic zinc prime coat, an epoxy intermediate coat, and a urethane finish coat) paint system? Is there a visual guide or specification for this in the industry or test results available for study?

What can be used in states that will not allow the use of MEK for IOZ testing per ASTM D4752?

What surface treatment is best when the maximum manufacturer recommended interval for overcoating has been exceeded?

Structural engineers often prefer mechanically galvanized bolts for accurate tightening while corrosion experts often prefer hot-dip galvanized bolts for superior corrosion protection. How do you resolve this inherent conflict?

In what circumstances is third-party inspection recommended for commercial coating work?

What causes amine blush in epoxy topcoats?

Your field surface preparation requires SSPC SP-10 and your field bolting uses hot-dip galvanized bolts. What surface preparation do you require/allow on and around the bolts?

Can water be sprayed onto an IOZ coated surface that has not fully cured due to low-humidity conditions to accelerate the cure?

How do you best remove lubricants and other contaminants from field-bolted connections prior to painting?

Is the MEK rub test a conclusive test to check the cure of IOZ coatings?

During newbuilding, do I have to stripe coat edges if I am using an edge retention primer?

What causes bubbling or cratering of epoxy intermediate coat when applied over epoxy zinc-rich primer?

What is the correct procedure for carrying out preventive maintenance painting work in a small chemical product tank?

Animal fat in slaughterhouses often penetrates concrete surfaces. If the fat is not removed before the concrete is coated, the fat can cause the coating to fail. How do you identify and remove the contamination before coating the concrete?

How do you determine the size of the dehumidification equipment required for a tank lining project?

How should a contractor respond when he/she reads a specification requirement that "the nominal dry film thickness of the coating shall be 3 mils"?

What is the best way to remove thick film elastomers from floors and ship decks?

As an engineer in a moderate-sized operation, how can I justify the cost of third-party inspection to upper management?

What is a self-leveling floor coating, and are there any published standards such coatings must meet in terms of smoothness or other visual properties?

What is the most important factor to determine in a failure investigation and why is it so?

What criteria should an owner use to determine whether to specify full removal or spot- or zone-repair on a maintenance project?

Why do we still need to stripe coat given the array of high-solids, edge-retentive coatings currently on the market?

What are the differences between calcium sulfonate modified alkyd (CSA) and high-ratio calcium sulfonate alkyd (HRCSA) in terms of performance and when and where each is used?

When and how should ambiguities between a coating spec, data sheets and responsibilities be clarified?

If you’re performing a QA inspection as a part-time consultant and the surface in question was blasted and painted two days before you arrived on-site, should you sign off on the work if the owner asks you to?

What do you do when there is conflicting information between the specification and the product data sheet?

On guardrails on a marine wharf, grating panels consisting of mild steel bars about 1/8-inch by 1-inch on a 2-inch-square grid were painted with a three-coat zinc/epoxy/urethane system. Inspectors are finding numerous pinholes in the finish coat along the inside corners of the grating where the 1-inch-thick bars meet at a 90-degree angle. These pinholes were not noticed in the zinc or epoxy coats, but the final coat's visual inspection is more detailed. What is the likely cause of the pinholing, and what could be done to prevent it on future applications? Also, what should the disposition of the parts with pinholes be, as in, repair, accept as is, reblast and recoat, or an alternative?

On a recent project, complex pre-fabricated, hot-dipped galvanized panels exhibited thicknesses in the range required for the entire subsequent coating system. It was not practical or possible to accurately map the thickness of the galvanizing across all the various parts, and DFT gauges available only measure the entire non-ferrous coating, including the galvanizing. How should thickness-per-coat minimums and maximums be controlled and verified for subsequent coatings?

What is the recommended coating system and procedure for repairing deteriorated inorganic zinc/epoxy/polyurethane 3-coat systems? Does the repair system or procedure vary with the degree of deterioration and if so, how?

If an atmospheric coating system of a zinc-rich epoxy, epoxy mid coat and polyurethane color topcoat has properly cured with no visual defects, should I be worried if the thickness of any coat exceeds any specified maximum?

Alternatives to coal tar epoxies in wastewater/sewage applications have been in service for a number of years. From experience, which coating types with what fillers at what thicknesses (over steel) have performed best?

Washing with potable water is used to reduce the soluble salt level on steel. However, such water contains low levels of various salts that will deposit on the surface as the water dries. At what point does washing deposit more salt than it removes?

Is a sealer coat always required for coating systems applied to concrete surfaces that will be exposed to marine environments?

Some specifications may have requirements that the inspector may know to be extraneous or may be more restrictive than necessary to obtain a quality coating application. What is the ethical responsibility of the inspector to reject non-conforming coatings that they know will perform as intended, particularly where attempted repairs may degrade the coating system?

Under what types of exterior atmospheric exposures (other than marine) is it necessary to test for soluble salts?

Under what conditions should small-diameter blisters (<1.5 inches) in a water tank lining be repaired/repainted? Should the blisters be broken and the substrate examined?

What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?

What are the most effective procedures for protecting steel and adjacent concrete together?

What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?

Should you paint the stainless steel outfitting (ladders, supports, etc.) in steel cargo tanks of chemical tankers?

How do I minimize corrosion at the splash zone on sheet pile and piping in brackish water?

In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion (MIC)?

Which factors are most important in selecting coatings for new concrete?

When blasting cast-iron structural steelwork, what type of defects might be found, and how do you address them?

What advantages/disadvantages have you seen with using recycled glass abrasives vs. traditional abrasives?

What tests should be run to determine if an existing concrete bridge pier needs rehabilitation or repair before cleaning and coating?

How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?

What generic types of coating materials best resist microbiologically induced corrosion (MIC)?

What are the pros and cons of specifying sieve sizes for abrasives?

What coating problems are likely in storage tanks that have dissimilar metal sides and floors?

How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?

We are restricted to applying road-marking paints during hot, humid summer nights, on surfaces very often below dew point conditions. What is the best generic type of marking paint to use?

How do you determine whether a lead-bearing coating can be overcoated or removed and replaced?

What is the best way to achieve proper surface preparation in areas with limited access, such as interior box beams on bridges?

How do you strip paint from a cementitious substrate if you can’t alter the surface texture?

How many times can a building be repainted before the paint becomes too thick to perform properly?

What are the most effective procedures for protecting steel and adjacent concrete together?

What types of measures can be taken on or around metal pipes or columns that penetrate concrete or asphalt paving to reduce corrosion at the interface?

How long can a blasted surface be left before priming under different temperatures/relative humidity environments?

When is it necessary to install sealant between the base of building walls and pavement to prevent moisture from wicking up the wall? How does the climate affect this decision?

How do you protect concrete against microbiologically influenced corrosion?

What is the optimal moisture content for masonry before painting can begin?

How can active corrosion be determined on a live pipeline?

What is the proper surface preparation for stainless steel before coating to resist a salt-laden atmosphere?

How do you determine if local water is suitable for use in UHP waterjetting, particularly in areas where potable water is scarce?

What are the advantages and disadvantages of using mechanical equipment inspectors or welding inspectors, instead of certified coating inspectors, to perform coating inspection duties?

What is the best way to prevent corrosion of reinforcing bar in concrete?

How does a lower-metallic-content zinc-rich epoxy affect the life of a paint system?

How do you adequately assess the adhesion of a newly applied coating?

What pluses and minuses have you seen with using recycled-glass abrasives vs. traditional abrasives?

What measures must be taken to determine and assure the cleanliness of an abrasive?

When is it necessary to install sealant between the base of building walls and concrete sidewalks or pavement to prevent moisture from wicking up the wall? How does the climate affect this decision?

What is the most common or economical coating system for rehabbing the exterior of above-ground storage tanks?

How do you determine the best type of coating for repainting a block or concrete building?

What is the best method for removing production machine oils soaked deeply into a concrete floor before applying a non-skid coating?

What are the performance distinctions among various types of intumescent coatings (for example, water-based, solvent-based, epoxies and methacrylates)?

When and why would I need to stripe coat if I am using an edge-retention primer?

When performing maintenance painting of tank coatings, what are the pros and cons of overcoating an existing lining that appears to be in good condition?

What are the most effective procedures for protecting steel and adjacent concrete?

When refurbishing an old concrete secondary containment wall around a storage tank, what criteria should be used to determine if a crack can be repaired for coating or if the section of the wall should be rebuilt?

How many times can a building be repainted before the paint becomes too thick to perform properly?

What is the best method for preparing newly galvanized steel to be overcoated with an epoxy system?

How pure must fresh water be for water washing or waterjetting, and how do you determine the water’s purity?

What can be done to prevent rust bleed in crevices when applying a zinc/epoxy/urethane system?

How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?

When applying a 100% solids, fast-curing polyurea coating on concrete, what is the best method for verifying that the proper thickness has been applied?

Which factors are most important in selecting coatings for new concrete?

What must specifiers consider when selecting and using sealants and grouts to fill gaps and seal concrete structures?

Which generic coating systems are suitable for protecting pipeline internals carrying highly abrasive media?

What are the criteria for selecting coatings for application during extreme (atmospheric) heat?

Are there special primers and surface preparation requirements for painting unpainted aluminum?

How do you determine whether a lead-bearing coating can be overcoated or removed and replaced?

How do you calibrate a DFT gauge in the magnetic field of a live power plant to measure coatings on steel substrates?

How do you know when pot life has expired? Can you extend pot life and, if so, how?

What health and safety precautions should contractors take when applying isocyanate-cured epoxies in the field?

How do you adequately assess the adhesion of a newly applied coating?

When should you specify UHP waterjetting on bridges?

What confined-space rescue protocol (internal, third party, etc.) have you developed, and why did you choose this plan?

What is an acceptable level of moisture in concrete walls before painting with an acrylic system, and how should the moisture level be measured?

Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible?

I’ve heard that the use of the proper blast media is critical for the successful application of thermal spray aluminum and other metallics. What mechanism would lead to the differing performance characteristics of the TSA based on the blast media?

How should a conflict between requirements, such as film thickness, on a product data sheet and the specification be resolved?

Under what conditions should you apply a resurfacing mortar to new, below-grade vertical concrete scheduled to receive a high-build, protective lining system for chemical containment or immersion service?

How can I determine the cleanliness of stainless steel for painting after blast cleaning?

What are the pros and cons of using an organic vs. inorganic zinc primer?

We need to paint our publicly owned lighthouse. What should I include in the specifications for this bid regarding surface preparation, coating systems, and other considerations?

I understand that the EPA is reluctant to allow the use of nanoparticles in coatings, due to their tendency to persist in the environment. What is the real risk, and how can the nanocoating industry address it?

How can you determine if a concrete substrate is in suitable condition for application of an acid stain?

I’ve heard about using crystalline admixture or crystalline materials on top of concrete to fill voids and make the substrate less permeable. When is this desirable, and what is the best way to use these materials?

When a specification calls for removing only loose coating from a masonry substrate, what methods are effective without damaging the intact coating that is left on the surface?

What are the common moisture tests for vertical, below-grade concrete structures scheduled to receive a high-build, protective lining system?

What smartphone apps or online tools do you find useful in your job? How do they work, and how do they help?

What kind of coating system provides the strongest resistance to staining from hot tires on garage floors and parking decks?

How do you assess salts and other non-visible contaminants on concrete surfaces?

What kind of coating system provides the strongest resistance to staining from hot tires on garage floors and parking decks?

How do you assess salts and other non-visible contaminants on concrete surfaces?

What is best way to remedy over-thickness of a topcoat after it has dried and cured?

What factors would justify coating stainless steel in water or wastewater service? What standards and methods apply?

How does one determine if concrete is sound enough to receive a thick-film coating?

How to do you abrasive-blast the interior surfaces of steel or ductile iron pipe scheduled to receive a high-build, high-performance protective lining system?

When a specification requires Manufacturer X’s system “or equivalent,” what does “or equivalent” mean, and who decides what’s equivalent?

How do you assess vertical concrete surface pH after surface preparation of existing concrete?

What is the best way to prevent tropical hardwood deck lumber like ironwood from developing a gray patina in sunlight?

How do you gauge the remaining service life of an aging FBE system on a buried transmission pipeline?

Can lightweight block (CMU) be successfully coated to prevent water intrusion, or is it best to build with standard weight?

How clean must the compressed-air supply be for blast cleaning, blow down and painting? How is cleanliness of the air determined?

On a parking deck with harsh exposures—to road salt, frequent wetting, freeze-thaw cycles, and exterior weathering—what generic coating type works best, and why?

Under what conditions should stainless steel be painted in the oil and gas industry?

How can you determine the moisture content of a concrete block (CMU) wall, and how can you judge when the moisture level is low enough to paint?

How does rapid depressurization affect lining performance in vessels and line pipe, and how can you identify any failure that might result?

What is the best way for me to assure I’m getting what I want when I specify a decorative finish such as glazing or gilding?

How do concrete admixtures such as hardeners and anti-dust compounds affect coating adhesion? What can be done to minimize negative effects?

What is the best way to ensure successful application of an acid stain to an existing horizontal concrete surface?

A specification for a bridge to be built of high-performance weathering steel requires an SSPC-SP 10, a profile of 3 to 5 mils, and metallizing with a final DFT of 10-12 mils. What challenges, time, and costs are associated with obtaining the profile?

What criteria should be used in deciding between a liquid-applied and a sheet-applied air barrier?

Is grinding the only way to remove large areas of a silicone coating from a ship's hull to replace the silicone with an epoxy mastic?

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