Well, here is what I got. The fender on my truck has been sanded to bare metal with an electric orbital sander with 80 grit paper. Then the holes for the emblems have been welded in, ground down, and filled smooth with bondo. There were also some minor areas that also have a thin coat of bondo. These areas have all been block sanded with 80, 220, 400 grit paper with Rustoleum spray can primer between each working. After everything was done to my satisfaction, I rolled on 2 coats of Rustoleum Rusty Metal Primer, straight with no diluting. I haven't sanded this primer yet, I was going to wait til I'm ready to paint the whole truck, but the fender looks perfect. Absolutely no sanding marks at all and you can't even tell where the filler is. BTW, the hood was also sanded with 80 grit on the orbital, then straight to the Rusty Metal Primer rolled on with no sanding marks there either.