If a PO has packed about 2-3 inches of bondo into some crevices, try the blow torch. Those sanders ain't gonna help in that situation. Plus, hell, you get to play with fire... It rules..
2007 Premium MustangCoupe (V6).. Please don't shun me
Replace Full floor pan
Replace Full cowl
Replace Radiator support
Shelby Drop done
Front disc brakes on
4 wheel drum to disc conversion, rebuild front suspension/steering, taillight panel, trunk floor,302 and AOD upgrade, wiring harnesses back in, and hopefully only patch panels on the quarters