A few months ago, I began clear coating my painted parts with clear coat in order to try and make them more fuel resistant. I colored the parts with the Stihl grey spray bomb and then clearcoated with Rustoleum Crystal clear once dry. It worked good on several saws. Then, the clear started to wrinkle the dried grey when applied. I tried it again tonight with the same results. I don't know if the Stihl paint changed formulations or what. So I'm looking for a clearcoat that won't attack the grey paint. The Rustolem I was using is an enamel. Should I try a lacquer or polyurethane?