We quit using paint stripper, too many downsides. For instance, if you strip with 80, you can leave traces of the factory e-coat without worries, but if you use stripper, every last molecule of finish has to come off, because it is contaminated by the stripper. Chris is on the money with the technique, we usually start with 80 grit 8" sticky discs on a soft backing pad, then finish with 80 DA. If we know that several paint jobs are on the panel, we will start with 40 to rip the top layers off, trying not to gouge the metal, then switch to 80 for the final stripping.