Good advice, kellhammer. i'm in the process of fixing body issues and sanding my truck down before I paint it with Interlux Brightside. I've got some major bondo repairs (ugh) and I can definitely see the sanding scratches from using 80 grit at the feather points into the metal. Backed off a bit with 180, then 400, and it looks pretty good now. I might go pick up some 220 grit just to make it perfect.