n8in8or
I never met a project I didn’t like
I like the fire extinguisher idea! Huh, I hadn't thought about the chemistry of the hardening.....oil contributing a Carbon atom..........that's cool!It will, but the difference between hot roll and cold roll steel is much more. We used to build side panels on work trucks like tree trimmer bodies or landscaper bodies, and that is exactly how you get it straight and fit.
We would actually use water fire extinguishers that are basically charged with air pressure oike a big squirt gun.
Water not having carbon to donate into the metal like oil quenching so it keeps the hardening down.
I bought a Chevelle 20 years ago that had a big dent in the rear quarter. This car was my first real attempt at body work. I started going after the dent with hammers and dollies and got it pretty straight, but I just couldn't get the last bit out because the metal had stretched - it was oil-canning. That is when my dad taught me the metal shrinking trick. I was pretty amazed at how well it worked. I was able to get the panel straight enough that it only needed a skim coat of filler to make it straight again.