I've begun wet sanding my black single stage paint job. I have orange peel in many places to level out. In those areas, I started with 800 wet, using a narrow flat Durablock where I can. I had a couple runs and drips, and I sanded those level with 600. My question is, what would be the next step up from 800? 1,000? 1,200? Would 1,500 be used after that?