sand blasting
Use crushed glass it is not as abrasive to the metal. I keep using it over and over . Get a large rubber truck tarp. When the blaster is out fold in the tarp and shovel it into a bucket through a window screen. Saves on the cost. Sand a is for steel beams or heavy rusted truck frames frames. coarse Black beauty is the worst I ever used. It eats and warps sheet metal
Use crushed glass it is not as abrasive to the metal. I keep using it over and over . Get a large rubber truck tarp. When the blaster is out fold in the tarp and shovel it into a bucket through a window screen. Saves on the cost. Sand a is for steel beams or heavy rusted truck frames frames. coarse Black beauty is the worst I ever used. It eats and warps sheet metal