I have a Paasche VL and love it - very rugged workhorse that I have sprayed all kinds of materials through (lacquer, acrylic, urethane, epoxy, enamel, ect). When you clean it, do you totally break it down to clean, or just run thinner through it? The brass cone/tip needs to be cleaned manually when you are done with it. If you don't have a tip reamer, soak the tip in lac thinner for a few hours, then use a round toothpick soaked in lac thinner to clean any dried paint material from inside. Also, make sure the needle is both clean of any debris, and not bent. When you reassemble the airbrush, make sure the needle is seated all the way in the tip before you tighten it down.