I used a two-component epoxy-based paint designed specifically for this purpose (if needed, I can give you the name, but I bought it in Europe for about 25-30EUR including S&H) and it worked like a charm - as for any paint job, you need to prepare the surface. This means washing, drying, degreasing, sanding, fixing the chips by some kind of bondo, sanding, wiping with lint-free cloth. When you have a quality dust-free surface, you're ready to go. After a year and a half, it is as good and strong as a new one.