How many gallons of air does a compressor need?
Air compressor tank capacities are typically specified in imperial gallons in the United States. You can find reservoirs with sizes ranging from 1 gallon to 80 gallons for commercial use.  It is ideal to have a compressor with a capacity of between 2.6 and 20 gallons for your garage. But for optimal spray gun and compressor performance, several experts recommend utilizing at least 50 gallons.