The issue with DA and that fine of paper is the residue will ball up and can make the scratches you are seeing. Especially if you don;t keep the paper clean. Should come out if they are not that deep with a wool or firm foam pad and medium compund. I usually use the 3M Perfect-IT II. Is the 3M white pad firm or soft? I use Megueir's and theirs are a different color. I would suggest wet sanding with 2500 to get your da marks out and then buff again.
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Mike Redpath
Musclerodz & Customz
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