3M also makes an 8" soft pad you can put on a grinder with 40/80/120 grit self adhesives sanding disks. Takes paint and surface rust right off no problems. Way faster than a DA sander and way cleaner more workable surface than wire wheels and things like that. Stripped several cars down to metal and will never use paint stripper again except in door jambs and heavily contoured areas. As with any type of grinding though make sure to work different areas as to not build up to much heat as you can warp the panels. Dipping works great also as stated above but it is expensive as hell, last quote I got was $5000 for a whole car.