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Problem Solving Forum (64)


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


What would be a reasonable service life for a two-coat, zinc-rich epoxy/epoxy mastic system, about 200-250 microns, in a marine environment? What evidence is there from the field?


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


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


What is the most effective available method for the treatment and preservation of the many cables used on suspension bridges?


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


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?


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


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


Where would you use epoxy and cementitious intumescent coatings?


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


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?


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


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


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


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


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


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


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?


I have several 20-year-old carbon steel tanks for storing demineralized water. The original coating (type unknown) has started to blister. What material, at what DFT, should be used to refurbish the coating?


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


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


What would be a reasonable service life for a two-coat, zinc-rich epoxy/epoxy mastic system, about 200-250 microns, in a marine environment? What evidence is there from the field?


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


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


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


What is the best low-maintenance approach to coating power-tool-cleaned field weld joints on process pipework that is protected with thermal-sprayed aluminum?


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


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


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?


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


Where would you use epoxy and cementitious intumescent 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°C? Why?


How do you repair polyurea coatings?


What are the limitations of rust-encapsulating coatings?


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


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


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


What causes amine blush in epoxy topcoats?


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


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


I am experiencing problems with a paint system on some vessels we built. The system is an ethyl silicate zinc primer, glass flake epoxy tie-coat and aliphatic poly top coat. The project is constructed from A516 boiler plate 1/4 in thick. Blasted to SP10 with 2.5 mil profile. Painting is being done inside a paint booth where ambient conditions clearly meet the specification. The coatings are exhibiting symptoms of solvent popping in a specific area on the exterior of the vessel. The problem only manifests itself over the back side of a weld that is on the inside of the vessel. We have made numerous adjustments to the system as well as the process to try to solve the issue. Nothing is helping. The manufactures reps are scratching their heads, and I am pulling my hair out. Any input would be welcome.


Which industries or market sectors are adopting the use of powder coating?


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


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


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


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


What is the effect of using a lower-metallic-content zinc-rich epoxy on the life of a paint system?


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?


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


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?


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


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


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


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


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


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


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?


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?


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?


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


 
 
   

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