I used a propane torch. It is easy to control, you know when it is soft enough. I used a paint scraper when it was hot enough from there with some care. Gum-Out carb cleaner easily took the remaining residue off. I followed that with a zinc (yellow) Rustoleum primer and smoke gray enamel top coat (rattle can). I did the whole underside of the car on my back with car on jack stands. Girl friend had just kicked me to the curb and so I took on the job. Between the beer and solvents, I probably lost a few brain cells on that job for sure. : )
