I want to try my hand at making blanks with resin. I picked up a Harbor Freight pot that I'll convert to a pressure pot. My problem is that my air compressor lives out in the unheated garage and is too large to bring into the house. What would be the smallest compressor that would work for a 2.5gallon pressure pot? I figure a 3 gallon would be too small since it needs to "fill" 2.5 gallons. Maybe a 5 gallon?