I've done two cars a 1970 Cuda and 1970 Roadrunner. It took a long time, but I only did it an hour a day or so; all I could stand. All I used was a scraper and a few worn old flat bladed screwdrivers. The undercoating was so dry it basically just scraped right off. Probably one of the best improvements I've done to these cars. Now I don't mind working under them at all, and it is very easy to maintain; just wipe it down every now and then. BC/CC paint holds up just fine.