I need to repair a deep scratch on the family car which was done either with a ski pole (accident) or key (dbag).

Plan is to:

- apply a few coats of base color to the scratch
- wet sand the excess from the factory paint
- use clear to build up the scratch above the factory paint
- wet sand everything level
- polish

What grit(s) of wet sandpaper should I be using, and in what order? 1000/1500/2000?

I realize that the repair won't be completely invisible, but I'm loath to shell out $$$$ to refinish 2 doors and a fender on a two year old car.

Thanks in advance