Re: media blasting - special considerations?
I did a fair amount of outdoor blasting on my car (frame, top and bottom floorpans, etc.) with a typical generic Chinese pressure pot and a 17 CFM compressor, and I never saw any sign of distortion.
If you are concerned, try an experiment before working on your car: Get a nice flat thin piece of sheet metal, and blast away, with the highest pressure you can generate. See how what sort of damage you are capable of doing.
Doug
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