Prep is a real important step. If your kit has tint play around with the material to get a good color match. Ensure that you clean the repair area well with lacquer thinner or acetone so the new gelcote can adhere well. I always liked having a bit of gelcote left over on a piece of cardboard so I could tell when it was fully 'set up' without having to poke around on my repaired area. For real small spots (nicks & gouges) I always used to use the cellophane that came on a cigarette pack. If you very carefully filled the damaged area before applying the cellophane it kept the sanding & buffing to a minimum. Mike