You need to look at what your air consumption needs are. Look at the papers that came with your paint gun and see what the cfm requirements are. Then increase that amount by 50%. You also need to look at where you are going to put the compressor while you are spraying and how much hose you will need ( in feet ) to get all the way around the item being painted. The compressor must be well away from any fumes as it will ignite them if they get near the electric motor . The more hose length you have the more the air flow ( volume ) is restricted which means you need larger diameter air hose and higher discharge pressure at the compressor. You will typically lose about 10 psi for every 50 ft of 3/8 in id air hose. If there is a local Sears store near you go there and look at what they sell as far as air compressors are concerned. You will find both oilless and cylinder type units in both 110 and 220 volt models. Thats why I said to figure out where you can put the unit, what electric outlets are available, 110 or 220? I would suggest that you want a unit that will produce at least 8 to 10 cfm at 90 psi.