The guy that blasted the hood, deck lid and valances also blasted my 72 Challenger with silica sand and it came out fine. The guy that owned the company before him did my 92 Vette with walnut shells and he made a major mess of it. Why does it matter if the panels have a little warping in them? if it was media blasted the your going to be doing bodywork anyway what's a little more going to hurt