This is the stuff to use(West Marine, aqua strip), safe for gelcoat. Worked well on pinstripe repair on 16ss. Works well on most paints, hard to tell what was used. Hand painted, I'd suspect signpainters one-shot. If you have some goof off, it might be worth a try. Try to avoid acetone based strippers unless your just doing small areas at a time. Never used oven cleaner before, might just work?
