Remove Undercoating

I don't know about heating i used a air scraper and just a regular scrapper and some elbo grease didnt have to use solvent or anything else except a wire wheel to finnish and that was removeing the old paint the colder it is the better it will pop off in junks by the weekend ill have new picts posted it is almost newly under coated with under coating witch is paintable witch it will be the same color as the car