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Problem Solving Forum (4)

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

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

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


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