Remove Undercoating
I just started scraping mine. I used a propane torch and a metal scraper. I got half of it done in one day. I think I may use a little solvent to get the rest off, before I send it to the blaster.
Heating it with a torch is the only way I have found to get it done. It goes fairly quick once you get in the groove, torch in one hand, scraper in the other.
Good luck and have fun. Just keep telling yourself that it's a labor of love!
Joe