-- Last Updated: Feb-06-13 7:02 PM EST --
epoxy. (the type that comes in the small package with the two tubes that meter it out). It costs a few dollars at most hardware stores. Get the five minute stuff and as soon as you apply it mask tape a piece of clear fairly stiff plastic like a notebook divider page or overhead projector film over it. the next day, peel the plastic and masking tape off, and the finish is as smooth as a baby's butt.
Give it a light sanding and spray it with a can of Valspar spray paint to match the color as close as possible.
Don't use Krylon. that stuff sucks.