I am using the Walcom gun, and have been for several years now. What I use is a 60 gallon compressor with a 6.5 HP motor. You will want at least a compressor that puts out 4-6 cfm at 40 PSI. You rpobably don't want to hear it but a 3-5 HP compressor with at the minimum 20 gallon tank is what you will need. I would suggest a 5 HP with a 30 gallon tank. Even though you are not going for a show finish you will need sufficient ari to run the gun. The bigger the tank the less noise you have to listen to.

David Reid