[Rob175]

As a graphic designer, my friends have always asked me to help touch-up a lot of their cars. All of the procedures previously mentioned will work fine. Although I've never sanded the area first I just make sure the surface is clean and free from wax.

As another mentioned, the type of brush is a very important part of the process. Most art stores or hobby stores sell a variety of brushes. I have some brushes that literally have just a few tiny bristles. In fact they're so fine that once "wet" with a tiny bit of paint (less than a drop) I can slide the wet bristles into and along the scratch. With several repeated steps of application, dry time, and re-application I can bring the thickness up to the same height as the rest of the car.

The "trick" is using the absolute finest set of brushes you can get....a large magnifying glass also helps. But slow and steady is the key. Once done and dry I wax, wax, wax.