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While having a conversation with car restorer about warping sheet metal resulting from media blasting, he showed me a '55 Chevy trunk lid he had blasted inside and out. Where the "cut-outs" were in the inner structure that revealed the back side of the exterior sheet metal, the panels were noticeably warped, distinctly only where the exterior metal was blasted on both sides. He said he had never warped a panel when blasting only one side, and came to the conclusion that when you blasted both sides, the temper was taken out of the metal, resulting in the warpage. I'd love some input and opinions from the pros on this forum.