They have System 3 Epoxy at all boat stores. It comes in a small packet and it's a 2 part mix. Mix it up and leave it sit, but not long. After it gets a little thick apply what you need. Then put some Glad Wrap over it leave it dry. That should give you a pretty smooth finish, once you take it off. You can use a Dremel tool to smooth it some, but if you don't over due it, it should look OK. Now put the finger nail polish over that, good luck.
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George