Have any of you ever used one of these spraying tools. It is a handheld canister type sprayer that holds any liquid / oil / etc. You screw the top on then fill the tank with compressed air by use of your air compressor. You can dial in / out the spray. It works great with WD40 and degreaser, at least those are the products I use. Mine was given to me as a gift, but I'm sure they are available at auto parts stores. They are great for cleaning, and spraying under decks.