I took off old undercoating on individual panels (undersides of fenders) by heating it up with a propane torch and using a scraper to take it off once softened. Keep in mind I did say on individual panels...You could probably do the same on the underside of your ride but exercise caution not to catch anything on fire or burn anything that does not need to be burnt. I used just enough heat to "soften" the old undercoating. You could also try using a wire wheel on a grinder.
[ December 28, 2001: Message edited by: capn ]</p>