My guy had the capability to do either dry or dustless blasting. He was the expert and I let him chose which to use. Maybe I was wrong about the warpage, but the addition of water would increase the mass of stuff hitting the metal. I don't believe that it's heat that causes the warpage, but the peening of the metal. MPandC has a video where he demonstrates the issues with blasting just on one side of a hood where the back side was made inaccessible because of reinforcements.
