Not sure if this was talked about but ANY air "tool" needs volume to work. Pumping up tires, nail guns, things in that order will work with the small compressors. 80 gallon with an two cylinder two stage pump is entry level to run air wrench sand sand blasters, even then the smaller ones can't keep up. I have 4, from a tiny Senco, a 4 gallon Emglo, an 80 gal Emglo and the shop 80 gal (can't remember the name) that's 43 years old and will still pump up from empty to full (150) in 4-1/2 minutes. All have their uses. If buying used, those will be your best deals, go brand name only. Tanks, motor will all do but the compressor is the main item, don't skimp on it.