I have fins cut from 1/8” ply that I’m wonting to fiberglass using a Foodsaver. I’ve already profiled the fins on both sides and was wondering what I should do to prevent any warping under pressure? I’ve watched John Coker’s video on laminating fins but I’m not sure what to use to back the fins with to avoid warping since they are profiled on both sides. Would it be ok to bag them without something backing them?