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On the other hand, blasting does generate heat. If you don't think so, aim a media nozzle at the end of your rubber glove. It gets hot in a couple of seconds.
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I didn't say it doesn't generate heat. I said it doesn't generate enough heat to warp a panel. It's the localized pressure as you laid out quite well in your first paragraph.
Some of these guys have some serious pressure coming out of their machines. For them, it simply helps get the job done quicker. Again, as you mentioned, get it in the wrong hands and your nice smooth panels can be toast.
You can reach out and touch a panel that's been blasted. It's no hotter than your car is sitting in the parking lot at the Ventura car show. So, I'd have to again say there's "one" issue. I own a sandblaster and with our control arms, hubs etc. we work with a professional sandblaster on a bi-weekly basis.
Do some Googling on the subject. It's actually spelled out quite well by others.