I agree with the others that it depends on how deep the scratch is. The fingernail test is a good indication of whether you are through the clear coat or not. If not, then the rubbing compound should work. 3M also makes a product called Finese-it. This is still a polish, not a wax. Basically, rubbing compound is like a really high grit sand paper. Finese-it is much, much finer than rubbing compound. I have used it on boats and automobiles.
You first wash the area clean with soap & water and dry the area. Then use rubbing compound to get out the worst of the scratches or dulling. Then follow up with Finese-it. At this point the paint or gel coat will look mirror finish. You still then follow up with a good wax to protect the finish.
I used to work at Overton's Marine supply (catalog company), and we tested this stuff on a friend's boat. It was a grey and yellow Mastercraft that had been used for about 10 years. The boat was in good shape, but all the shine was long gone from the fiberglass. When we finished with the process, the boat looked like it had just come from the factory floor. Excepting of course for where there were any deep scratches that went through the gel coat. You could literally see a deep reflection of yourself in the finish. Anyway, just thought I would share.
'07 VN900 Classic
Horsepower is an illusion.
Torque is the source of all good things.
Last edited by Jeep Pirate; 08-05-2010 at 08:52 AM.