This is a great medium for thinning acrylic paints, especially for use in airbrush systems. It is clog and buildup resistant.
From the manufacturer:
Designed for modifying the GOLDEN Fluid Acrylics for airbrush/spray application. Blends with minimal effort with the Fluid Acrylics to yield a paint mixture with the proper viscosity for airbrushing. Effectively decreases clogging and tip buildup during spraying, eliminating the largest drawback to airbrushing with acrylics. While designed with the Fluid Acrylics in mind, Airbrush Medium will also reduce the Heavy Body, Matte, High Load, Iridescent/Interference and Fluorescent Acrylics for spray applications. GOLDEN Mediums and Gessos can also be blended with Airbrush Medium for spraying.