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When shopping for a compressor always look at the CFM @ 90psi rating. Most tools operate at or around that range. More CFM then you need is always better. Most modern HVLP paint guns operate well below 90psi, but tools like say a DA sander or a sand blaster/soda blaster will need large volumes of air for extended periods of time. This is what’s referred to as CFM, or cubic feet of air per minute. A good rule of thumb when buying a compressor is find out the CFM requirement of your tools and buy 15% higher CFM then your most air thirsty tool. That way you will never have to sit and wait for your compressor to catch up, or worry about it overheating. Keep the filters clean, change the oil often and keep the tank drained of water/condensation and it will give you many years of good service.