Interesting comment about heat from blasting not warping sheetmetal. I don't know if your comment is true or not but I don't think the bit about the metal getting hotter in the sun offer much prrof.

When a car sits in the sun, it all gets hot more or less evenly and slowly. When you balst, I can easily believe the abrupt rate of heating and the fact that it is localized plays a role - if not all of the cause. Of course, the pressure can't help either.

I have a couple goodsources for blasting near me and they use completely different media (one uses plastic, the other uses common #4 sand) but neither has warped any panels of mine even when I had a whole car done. They know how to do it.


I prefer the common sand as it truly gets you a near white blast with a good anchor profile.