Media Matte Medium is an acrylic medium that allows you to change the properties of Media Fluid Acrylics and increase the number of ways they can be used. Its most common use is to increase the transparency and thickness of the paint. It will add translucency to the more opaque colors, and will make the very translucent colors more opaque. Extremely versatile, Increase transparency, Non-toxic. How to Use Matte Medium? Use as a topcoat or mix with Media Fluid Acrylics to increase their color transparency. Use to decoupage or to create image and photo transfers. Use as a barrier between solvent-based products. Use as a clear ground. Use as a spray fixative when thinned with water to prevent smudging.