Thought I could skip a few grades of sandpaper but wasn’t happy with the results. Dropped down to 220 and sanded down to the raw aluminum. Dry sanding first, next will be wet sanding with the 220. Then I’ll be repeating the same process with 320, 400, 600, 800, 1000, 2000 and then finally polish.
This method is tried and true giving the mirror like finish. Once again this is my process & my opinion, it may differ from your technique.