Every now and again, if scratches get too worrisome, I just use a little T-Cut on the problem areas, clean, and re-wax. I sometimes use Meguairs wax for scratched surfaces as well. I have a 531 frame with some paint problems because it is painted with DuPont Imron, which is a great paint, resists scratches and fading, but has the tendency to pop off in spots as well. Most older Treks are like this. The idea is to look through nail polish or model paint varieties until you find a match. In my case, Tamiya model paints had just what was needed.