Do a test spot first (suggest somewhere on the roof). I'd even tape it off just to be sure you can see any differences. Since it's been polished before, you want to be careful that you aren't taking off too much of the clear coat (especially if it was done poorly before). Keep the speed around 3-4 and work in a 2x2 area (cross-hatch pattern). Slow and steady passes with 50% overlap (1 up/down, 1 left/right). Check your work and then go from there. Might even suggest a one-step since it's your first time. Sonax Perfect Finish and a Rupes Yellow foam pad make for a great combo. Just be sure that you're blowing out/cleaning off your pads after every section/panel.
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