That is what I use to polish my needles.
Everyone will be quick to write off a cheap airbrush as the problem but if you are shooting acrylics tip dry is just the nature of the beast. As you get more familiar with your brush and techniques you will minimize your tip dry but it is gonna happen no matter what airbrush you use.
Hey, I just learned about this stuff. Cheaper than Polywatch for the same sort of thing, if you haven't already bought it.