I just bough my 1st air compressor and it is a little 2 gallon table top for small projects. It is a Campbell Hausfeld brand. Seems to work good but I have one small problem. The threads that screw into the air gun leak air. I have the brass fittings as tight as they can go. How do I stop this leak? I noticed that all other threads on the air hose and other fittings have a blue color coating on the threads. Do I need to coat the air gun threads also to stop the leak? If so what it that stuff called and where can I buy some? Thank you!