I've got a 2 hp compressor with about a 40 gallon tank which keeps up to my gun, spraying at about 45 lbs, which I use for both paint and primer. Make sure you put 1 or 2 moisture traps in your air line to catch the water in the air. Wear surgeons type gloves when ever you go near the car and also invest in a good respirator with replaceable cartridges as well. Fumes from this stuff are brutal. Use wax and grease remover on all surfaces before you paint. High build primer is like liquid bondo which flows quite nicely into scratches and low spots but make sure you use an epoxy primer on bare metal first.
