I am finishing up a few minor repairs to my daggers and rudders, you know the little nicks we get here and there. There are a couple of shallow (1/16 inch) or so nicks only effecting one side of the foil. Instead of filling with epoxy and finishing with gelcoat I was thinking of thickening the gelcoat for the these small nonstructural repairs. The gelcoat is white. What would you thicken it with?