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Problem Solving Forum (133)


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.


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?


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?


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


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?


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


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?


 
 
   

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