Recently got a porter cable DA. I have some spare panels, and I junk DD to practice on. Anyone got some good links. Specifically how to get all those fine scratches out after the wet sand. I tried 1200-1500-2000-2500 on a white panel. It is smooth and shiney, but I can still pick out the micro scratches. Using chem guys v32-v38 products and meguires foam pads.