these clean and strip discs work great for paint and rust removal. wear glasses and gloves for sure though (found out the hard way with the gloves, if I would only leave those guards in place, lol). available with a drill style arbour or a roloc style as well. bodyshop supply places should have them. I just tried a couple sizes, 4 1/2" electric disc grinder and also air angle die grinder, and they work awesome. strips down to metal in a hurry and not much metal damage/scratches. epoxy primer over top and the scratches fill easy.
https://www.youtube.com/watch?v=Qgvp2ok0PlI