I'm redoing this 1987 Marlin and my first priority, since I have the engine running well, is to re-paint the whole thing. It is chocolate brown and tan... UGLY!! I am now repairing the holes and scrapes in the fiberglass. My question is, what is the criteria I should use to determine whether to use a polyester or epoxy gelcoat? And, can I effectively use auto paint as base color then gelcoat over that or should I use tinted gelcoat for color? It will only be used in freshwater lakes. Thanks for your help.