I would highly recommend Signature Finish paint instead of gel coat, which I'm not sure you can apply over the Interprotect epoxy anyway. It's not porous like gel coat and much tougher, and one of the few urethane paints that will hold up under water. It's safe to roll & tip outdoors with a good NIOSH respirator. Mine came out fairly smooth and glossy just using a foam roller. It's also easy to mix up small quantities for touch up using small plastic syringes to get the exact mix of paint/thinner/catalyst.
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