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Actually there is no need whatsoever to use gel coat, especially since the bottom will be barrier coated and painted. Simply fill the voids with a two part waterproof filler and sand. Interlux and Pettit each make one. After application, roll on 4-5 coats of barrier and you're set. Gelcoat is only necessary if you're making a repair to existing gelcoat that won't be painted over.
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