glass bead leaves residue behind, and is not recommended for anything that will be painted, or powder coated.
We blast all day, every day in preparation for one type of finish or anther, and we use aluminum oxide.
does not build heat, distort sheet metal, and removes faster than glass bead, black beauty, ect.
blast sheet metal at 40 psi no higher ( profile the material to much )
anything above 16 GA, 70 psi is fine
just my 2 cents
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