Sometimes they mention finding paint residue in the valve. They usually write that they clean the air valve assembly, and it works OK for a short time and then begins sticking again. Sticky Trigger For some reason I seem to see this problem most often from Iwata owners. Make sure all the parts are clean and work smoothly. It may return to normal if you let it air out for a few days. If you’ve gotten lacquer thinner on it, it may have swollen enough to jam. There is probably a little rubber O-ring that could be damaged. See the photo on the right of a Badger air valve assembly. There are some very small parts and a tiny spring. If air doesn't come out, then the only thing left is the air valve assembly. Obvious question: Did you disconnect the air line from the brush and check that your compressor or other air source is supplying plenty of air? You can quickly eliminate these as the cause of your problem by swapping them out.
One other thing spare parts are nice to have, especially the needle and nozzle. But it is a precision device, and tolerances are tight. As you can see if you’ve read that page, the airbrush is basically a pretty simple device. It may make the information below easier to understand. If you haven't read my Basic Stuff page, you might want to have a look at it.
Paint has to be really thin to work in an airbrush, especially if it has one of the smaller size nozzles like. Before you blame the brush, see how it works with plain water or thinner. Some airbrush problems are really paint problems. I would suggest you use a magnifying glass (the stronger the better) and a good source of light and really examine all the parts. But it doesn’t take much dirt to mess up an airbrush's operation. And you may be frustrated because you know you’ve cleaned the darn thing several times already. This is a pat answer, and often it works.
You will probably be advised to clean your brush again. Not only might you be helping someone else with the same problem, but the person who helped you might be more inclined to help you or others in the future. And, if you do get help, please come back with the results, and maybe even say thanks.
I know this is just common sense, but many people just don’t think about it. Include the airbrush brand and model, the type and brand of paint, the air pressure, exactly what the symptoms are, and what things have you tried so far. So if you ask for help, try to give as much information as you can. What’s wrong with it?” Okay, that's an exaggeration, but not by too much. How do you respond when somebody writes: “My airbrush doesn’t work. People try to help, but sometimes it’s pretty tough. I have monitored several airbrush and modeling forums and I've seen a lot of postings about airbrush problems.
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