While airbrushes are a handy tool for speeding up your painting process, figuring out how to thin your paints can be tricky to master. We've done the hard work for you. The Army Painter Airbrush Medium is a 2-in-1 thinner and flow improver and has been developed to enable our superior quality Warpaints to be used with an airbrush. The Airbrush Medium makes airbrushing - easy!