I have already purchased the Caswell powder coating system. How larger of an object is the gun capable of coating. I have read about some guns being 20KV and some 16KV. Will the gun I purchased do a motorcycle frame. Should I move the grounding clip to different parts of the frame. Does the Caswell on line manual cover powder coating? I am thinking about subscribing but it would be a waste if it does not cover PC. In some of the other articles I have read they mention IR propane heat. What does IR stand for?