I have used an 8" mud hog with 40-120 grit to do my striping of paint , works great , less speed means less heat build up , faster paint removal .

GM cars were sprayed with lacquer and with alot of heat , Lacquer will remelt /reflow and clog your sand paper , so if you use a slower speed it cuts a tad faster and wont use as much sandpaper !
Other brands were using some form of Acrylic Enamel , ( Aclyid or Acrylic ) So they dont clog as bad .
FYI