I have a Porter Cable model 7335 variable speed ramdon orbit sander that I use for both wood working and auto body work,it's a great tool.

Many body shops that do superior work use air powered random orbit sanders with relitivly fine paper to take old paint off to bare metal. Sandblasting can warp metal, paint removers are very messy . bigger body grinders with coarse paper are fast but can thin metal.Medium other than sand will also do quality bare metal jobs.......

William Rogers.......