You can get away with coarser sand and higher pressures on cast than on sheet metal. If all you ever blasted was cast iron, you will probably warp your first sheet metal.
My neighbor who restores old Chevy pickups uses fine silica sand and proper respirators to do all his blasting... Myself I prefer black beauty for the heavier stuff.. it is quicker and does a better job on the heavy pieces, like grilles, frames, and axles. I don't think I want to blast the tranny unless it is really ugly and the ol wire brush can't handle it.
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Quietlines and narrow frames, mostly projects but I mow with a 1200 and have a 122 set up for pulls. Wandering the country bringing towers to wind farms everywhere, and bringing yellow stuff home to Texas. Also into flatfender jeeps.
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