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I would say to drop down to an 800 or a 1000 grit and sand in the vertically to remove the scratch pattern. doing fine circles will eliminate the pattern as well.

I stay away from power tools if at all possible. Just good old 3m sandpaper. I just take it in steps down to about 1000 grit. It takes a while to remove the metal but I am not in a hurry. Sheet of...