My opinion is to roll on some gel coat. You can't see most of what you will be doing when it is in the water, and you will likely bottom paint it anyway. The only place where smooth counts is the planing surface, and that's if you care and had a smooth surface before to compare to.
Gel coat is also relatively safe in terms of accidental exposure to wet material. It smells, but isn't poisonous like urethane paint or a sensitizer like epoxy.
Hermco mentioned the 3M vinylester below waterline marine filler if you need it. Or Mertons has hull and deck putty in polyester. I haven't used either, but just bought the filler from Mertons- just before I heard about the 3M from Hermco.
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