removing undercoating

I just did this last summer. I removed all the under coating on the inner fender area and the back side of the fender. A scraper and heat gun worked best for all the heavy stuff. came off real easy. I also bought a needle scaler from Harbor Freight but found it didn't do to well on the undercoating but was great with anything that was rusty. Definitely worth the $25!

once I got the heavy off I used crud buster wheels like these:

https://www.kimballmidwest.com/Catalog/CatalogIndex.aspx?p=6.340.101.316.1963

I didn't buy from here. I used a local auto body supply shop but you get the picture.