Sand blasting WILL cause warpage. Yes, you "can" sandblast just about anything and not cause warpage, I personally don't want to take the chance. And YES, I have had a "pro" destroy a couple of 32 Ford doors once.
It is not caused by the heat, it is caused by as Mike said, by "micro peening". A sand blast warped panel is all but trash, I don't want to take the chance personally.
Now, this is with SAND, walnut shells, plastic, soda, these are all different animals and don't have the weight behind them to "peen" it.
Brian
