Question about sanding

Depends on what your sanding. For body, I will start with 180, move to 220, then move to 320. I'll prime, then add a gy-coat(sp). when sanding primer I'll use a 320 with the gy-coat (dry) applied. When I wet sand I'll use a 400-600 grit and go from there. But again, depending what your working on.