I've been using a 60 gallon, single stage, 220v, 19cfm IR compressor that has no problem keeping up with anything. No waiting for it to catch up to me. Devilbiss Startingline guns for primer, HF Black Widow for finish coats. I started long ago with a CH 25 gallon, 5 hp and wouldn't keep up with anything! One lug nut, take a break, next lug nut, take a break. Cutting disc tools were useless.