Problem Solving Forum (7)


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?


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


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?


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


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


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


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


 
 
   

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