Alex,
I've got a 5 hp and a 3 hp compressor hooked together to run the blaster and they'll just keep up at 100 psi. I've got a 4 cylinder one with a 7.5 hp motor but haven't got it running yet.
Getting rid of the dust when blasting is very important. Even if you had grit that wasn't dangerous, I can't imagine the fine paint and rust dust would do your lungs any good. I wear coveralls, a breathing dust filter, ear plugs, and a sandblasting hood with replaceable Plexiglas lens. With that fan on the cabinet I'm working in clean air, but you can still get the stuff blowing towards your face when it bounces off the work.
When I need to blast something that won't fit in the tank I do it outside with the used sand and just let it go.
I bought $130 worth of sand and used about $100 of it blasting the four wheels for my C8 so you can see why I need to reuse it as many times as possible. With the cabinet I might be able to use river sand instead of bought stuff as the dirt won't be such a problem.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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