Airbrush Medium has been developed by The Army Painter to enable our superior quality Warpaints to be used with an airbrush. The Airbrush Medium is highly versatile, and can be used with success on other high quality acrylic paints. The Airbrush Medium should be applied in the approximate Ratio of 1 part Medium to 1-2 parts Warpaint. The Army Painter would like to remind our customer base that selling on Amazon or other 3rd party online platforms is against the company policy of The Army Painter.