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I have seen mention of walnutshells used for blasting the bod of a car. They are supposed to not leave any pitting, or warp the metal. Problem is that there is no local source for them around me. If I sandblasted the exterior, and then went over it with the DA and 180 grit paper prior to painting, do y'all think everything would be ok? I have not experinced any warpage or heating of the pannels I've blasted so far.
Max Kern
 

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Warpage is caused by the bigger sandblasters that are used in the commercial arena. I doubt a small blaster will garnish that kind of heat. Be careful with the silica sand as it is a health hazard to the lungs and have fun...
 
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I use a product call Black Beauty that I purchase from the local tool rental store. I have used it on the under carriage and under fenders with good success. I have a small blasting setup that I got at Sears and have never seen warpage or heat buildup. I have seen a lot of static electricity though. Need to be careful around any areas where there could be fuel vapors. Good Luck.
 
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