What causes Gelcoat to crinkle about 30 minutes after applying with a spray gun? I went ahead and did my layup over this bad spot in the corner because my cut line is a 1/2 inch below the bad spot. This is only my second time making a mould. This is orange tooling Gelcoat with 15% Duratec added and 1.5% MEC. I sprayed the mould with APV and let it dry for 2 hours. I’m shooting the Gelcoat with a 3M Accuspray gun with a clear 1.8 head. I will have to spend more time with this gun. With the 1.8 head it just spits Gelcoat. A splatter gun. Thanks for your help so I can learn these processes. Allen