Originally Posted by john211
I'm serious about what I'd do. Get a large-headed plastic fastener. Nylon? Chamfer that hole slightly in the gel coat so as to hopefully eliminate sites where cracks can initiate and then propagate from there. Slather 5200 around that fastener in the hole. And ... get back on the water ... pronto.
Or... you could use 5200 or epoxy to fill the hole, add some gelcoat to get the color right. Allow about the same time to cure as your "fix", then sand/finish off the gelcoat at a later date when you feel like making it look good. Accomplishes the same result without the ghetto fabulous, shade-tree mechanic look of your repair.
Not to flame you, but if you're going to take the time to fix the hole don't make it look worse doing a half-assed repair job.