Check out Part 10, of the TACO Marine Project Boat that is filled with prepping and painting tips. For example, before painting the deck, a product called Super Poly-Fill putty was used over some exposed structural fiberglass in the splash well to provide a smoother surface for the paint. If you have some micro scratches in your gelcoat, they recommend Gelcoat Putty that’s used for that finer type of repair. But if you need to repair below the water line, it’s best to use Trowel-On Epoxy Putty which is resistant to osmotic blistering for a more permanent solution.
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