i will on occasion, blast the outer panels ,if it is the origional paint with nothing on top of that. i stand back about 4 feet and hit it in an angle moving the nozzel back and forth quickly not allowing the sand to hit in one spot very long,and not tryng to get every thing off such as the origional primer .that i then D.A. off. i recently did a 67 fb.that the guy blasted .he got it spottless but warped the crap out of the roof ,quarters, and tail panel, and i had to replace all of it. i wonder about the bed liner i sprayed. some day someone is realy going to **** about it because i dont think it will come off at all.