Thanks for the reply, but not having ever worked with car paint, that description isn't all that helpful for me. Approximately what percentage are you using gelcoat to styrene? 50/50, 75/25, 90/10?
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I can't be sure of the exact ratio, since the gelcoat/additives/pigment(s) I was using may be different than yours. I went for the viscosity rather than an exact ratio.