why do these guys still push the 0 warpage because the water cools the piece ? over the years i have seen at least a dozen threads where the temp of metal was measured while blasting . we all know heat has nothing to do with it but you will get pummeled if you say that in one of the other forums or worst yet on fakebook . i've also notice a majority of them have no experience other than buying a trailer full of equipment and reading the manual . my media supplier sells used rigs because the guy who bought it went out and destroyed a bunch of sheetmetal and bailed .