If you find the Wagner Paint Eater a bit underpowered for the job, a Norton Rapid Strip disc in a 7" variable speed polisher works fantastic. The one Harbor Freight sells works great. Norton sells the Rapid Strip discs in drill size, 4-1/2" grinder size, and 7" grinder size. They just screw right into a 5/8" arbor thread. The 7" in a polisher has more horsepower and surface area than the paint eater with the same kind of self-cleaning abrasive material. It hardly bothers the metal.
