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Problem Solving Forum (17)


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 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?


Where would you use epoxy and cementitious intumescent coatings?


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


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


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


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


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?


How, besides grinding, can one remove large areas of silicone coating from a ship’s hull to replace the silicone with an epoxy mastic?


Where would you use epoxy and cementitious intumescent coatings?


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


What causes amine blush in epoxy topcoats?


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


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


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


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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