1000 grit is for sanding runs out of a fresh paint job, detailing before buffing, removing orange peel, etc. To actually remove layers of paint you're going to need 400 grit or coarser. Once you get the color change you want by dry-sanding with 320 or 400, wet block sand the whole thing with 600 or 1000 grit and water, clean up well, and spray a couple of layers of clearcoat.
Jerry
