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Problem of shrinkage when spraying an acrylic polyurethane topcoat over an epoxy primer?

2009-02-14View Original

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When the epoxy zinc-rich primer produced by our company is applied to steel structures and a topcoat is applied after spraying it for half a month, large-scale shrinkage defects occur; the topcoat in question is an acrylic polyurethane. Sometimes, if the intermediate coat of epoxy ferrochrome paint is not covered with a topcoat in a timely manner and is left for an extended period, large shrinkage pores can appear in the topcoat as well. Is it due to the resin or the curing agent? The resin is South Asia 901, and the curing agent is Miki’s 650.

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Translated at 2026-07-28 05:31:13

Original: https://bbs.hcbbs.com/thread-389740-1-1.html

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