I know the owner of the company, and have used a "test" machine several times. It has NEVER warped anything I've blasted. Ive blasted my entire 1970 camaro and many parts. I have no history using the machine, besides initial training from one of the company engineers.
There is so much misinformation about these rigs, its ridiculous.
1. Pressure matters. If you crank the pressure up, yea, your ganna mess up whatever your blasting.
2. Tip selection. There are several different tips you can use. If you use the tip that puts all the pressure in a small area, you will have issues.
3. Media. There is a specific type of media you use, if the blaster tries the go cheap and not use the recommended media, you will have issues.
4. Technique. If you bare straight down on the metal, and not at an angle, you will have issues. This is probably the most important aspect of using one of these machines, all the previous issues can be overcome if the user knows what's going on.
5. Time. If you slow down and do the job right, you will have less issues. Most independent blasters out there rush jobs, thus more pressure, less time, less technique.
6. Thickness of metal...obviously blasting thin metal will warp...again, nothing on my camaro warped. Including aftermarket hood.
The only thing I would say from a negative perspective, and this was my own fault...is that media goes EVERYWHERE. I should have blasted car completely disassembled. The opportunity came up, after I had put engine and transmission in car. It was a choice of pulling everything back out, or trying to tape it up. I failed miserably to tape it up. Media went everywhere. I spent a LOT of time vacuuming and air blowing media out of every nook and cranny on my car.
Anyone has any questions about Dustless Blasting, Id be glad to answer, or relay them to company. From what I can see, issues that arise from DB, is 90% user error, if not higher. There are many elements to using the machines.
Of course, I sprayed everything with SPI epoxy.