I just realized that I had a rear taillight housing for 74 challenger sitting here blasted with 20/40 coal slage. I't in my full time heated garage and is not rusting yet. I don't touch it with bare hands.It'll get blasted again after it's welded back on the car.

It's sitting next to a deck lid that I did with plastic, real fast because I was running low on plastic and I knew I wasn't gonna use it on my last car.
It had 2 red paint jobs on top of that body work. Someone had already sanded off the original color and laid down some red oxide with holes sanded in it!!

I bet the first red paint didn't turn out so well, that's why there were 2. It never looked that good when I got it either. Except the biggee, no rust, no where. It was a dream car to restore.
The deck lid needs a DA taken to it to make it bare. The plastic took pimer and 2 paint jobs off of it though real fast.

Whoever said plastic is slow, is wrong. It cut's just as well or better than coal slage. Just shoot it at a lower PSI.