Haven't used it yet just to clarify. Immediately after unpacking this brush, there were problems. The photo shows that there are spots on the nozzle. I had to use fine sandpaper to remove the burrs and excess metal sticking out of the hole. While my camera work may not be the clearest, hopefully you can see that the hole for the nozzle cover is off center as well. I measured the nozzle cap at 0.035 with a calibrated set of NIST traceable gauge pins. The needle jet itself is designed for . 010. Tolerances are small. Speaking of machine work, let's talk about the cup. I put the brush on the can and you should have a nice clear picture of how bad things are. It looks like someone placed a coarse conical whetstone on the drill press and had the student work on it. You can see the lines rubbed into the metal, which I assume is pretty soft. I have Brinell and metallurgy tests that I could do in a lab at work (I work as a quality and layout specialist in the automotive industry), but most of these tests are destructive. It will be absolutely uninteresting to clean. The paint will just stick to those lines and won't want to feed the mug. Needs more polishing. If this cup was detachable it would be much better. When I partially disassembled the brush to check tolerances, I noticed that the needle was slightly unevenly discolored, as if it had been in a damp warehouse while leaving the needle unpolished and ungreased. . I also sanded the needle with very fine sandpaper. I recommend additional buffing with something like auto valve guide polish and a Q-tip. The smaller O-ring for the needle jet was crimped from the factory and wasn't sealing properly. I almost wish they had shipped this with the .20 needle removed like the .30 and .50 include. At least then it won't be mis-seated, or at least include a set of spare O-rings. It's probably a lot cheaper for the seller than sending it back. I plan to dig into this a bit tonight and will update my findings if they're helpful. Now let's discuss the final thoughts (for now). There is something to be said for value for money. This isn't an Iwata microcustom, and the price clearly isn't. I plan to use my airbrush as a hobby and draw scale models. I'm not trying to make a living as an artist. There comes a point where anything you want is good enough for the buck. Again, I didn't use a brush. I wanted to test it for problems and try to do preventative maintenance and tuning first. We'll see how it goes. However, at first glance I don't think this brush is worth the roughly $40 I paid for it considering how long it will take me to get where I want to be. Simply cleaning the mug as is after each use will probably take twice as long as with the best brush, and possibly hours of polishing if I want to prevent this. Buying something like the Paasche Vision will likely save you hours of work or frustration for an additional $60 or so. I might change my mind after using it but so far I can't even recommend it for the money. Update after using the airbrush: I have requested a refund and am returning the product. When I used the brush, the paint didn't flow at a consistent rate even when I was sure I wasn't pulling the trigger. It wasn't the pulse you would see with a compressor problem. He drew for a few seconds, paused, and started again. Without moving the trigger, the color would start with a very thin line and then suddenly become very wide. I cleaned the needle regularly and it had nothing to do with the tip drying out. Before using the paint I followed the printed directions and ran water through the brush to remove machine debris or oil, but I added some dish soap to the water and it started blowing bubbles out of the delicate air control valve located underneath is the paint cup. I filmed it. I'll see if I can include it in this review. I have come to the conclusion that even for this money it is much better to save a few cents and buy something like the Paasche Vision or the GSI Creos 270. I haven't decided what I want yet. This brush just isn't worth the hassle. I suspect that some of the best reviews are only written by people who got lucky and managed to get their hands on a brush that was (probably by mistake) properly processed and cleaned. I would venture to guess that out of 30 produced 5-10 might be acceptable in terms of quality control. I don't want to spend $40 three times to find out.
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