[DRJDVM's '69]

I did mine with oven cleaner, scraper, torch, wire wheel and power washer.

Mine was on there thick and hard... so I had to use a combination of stuff. What a frickin mess.

I spoke to the shop that was gonna blast my car and they said alot of undercoating is hard to get off since the beads want to bounce off it or just dent it in.... takes alot of time to get it all off. They could do it but it added quite a few hours to the job. So doing it myself probably saved me a couple of hundred bucks....but it was a huge PITA.