I have no experience with gelcoat but my understanding is that you would need to do some fairing work on the gelcoat if you are putting it on outside of a mold. It seems like you could just fill & fair and them prime. Pick the appropriate fairing compound you shouldn't need the intermediate step of gelcoat. You could tint your fairing compound if you are looking for a more uniform color but it probably wouldn't matter if you are going over it with new primer and paint.
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