100 Grit should go through that factory paint pretty quick, check the nozzle tip on the blaster gu. These wear out pretty fast, and if worn out, will not concentrate the media correctly. Obviously make sure your getting enough psi to the nozzle as well and that the water/moisture separator is working.
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70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55
71 Porsche 911 Targa
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