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ask around, they will tell you not to sandblast sheet metal especially large flat areas like the door skin or hood, because their high pressure, high volume guns will leave the metal wavey and wrinkley.... but there is this other stuff they use called powder blasting.. its the same consistency as like flour or baking soda and its extremely effective and leaves the metal pristine.. Its going to be very pricey to do that much metal though. Like approaching the price of new GM metal..
let me know what you find.. another possibility if you've got the cash is having the metal dipped. Dont know much about this process but its supposed to be even BETTER than powder blasting.. Its gets in every crack and crevace... interesting stuff too, keep us posted
mike
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