Thanks for your input! When I'm talking about boat hull work I'm talking about doing them in a mold, the gelcoat goes in first then the inner layers so to speak.
Maybe we have different gelcoats in Europe, it's only when using it as a top layer that I know you have to mix in some wax to get it to cure properly.
As a side question, have you tried using epoxy resin for your fiberglass? Will it bond properly to the PU resin? As it's easier to work with indoors that hopefully will be my route.
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