polishing
The question about which compound after sanding depends on the metal type, along with what grit you quit sanding. In some instances the emery compound can create more scratches after sanding. I know that most skip the emery on aluminum and go to the tripoli, followed by cleaning with brake cleaner and then white rouge.
Abrasive in this order Black emery, tripoli, white rouge. They make even more mild and aggressive rouge blocks also.
it has some good info/pics





