You can use sand or smaller grain slag for limited rusty areas. But you have to be careful and do a small spot at a time. It will warp panels from the heat and stress it produces.
I like to keep an air hose w/ a blow gun right beside me. I'll blast less than 2 sq. inches, then blow the metal cool w/ the blow gun.
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SECOND AMENDMENT: AMERICA'S ORIGINAL HOMELAND SECURITY!
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