Problem Solving Forum (98)


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?


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


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


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?


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?


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


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


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


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


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?


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


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?


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?


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?


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?


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?


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?


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


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?


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


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


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?


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


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


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


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


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 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?


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


Theoretically, how many LEED credits can be acquired for a newly constructed building through the use of coatings and related technologies?


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?


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


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?


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


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


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


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


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?


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


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


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 pavement to prevent moisture from wicking up the wall? How does the climate affect this decision?


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


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?


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


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


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


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


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?


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 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?


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


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


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


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


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


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?


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?


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


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


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


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


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?


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


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


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?


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


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


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


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


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


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


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 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?


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?


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?


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?


 
 
   

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