MTN Water Based 300 Spray Paint - WRV - Matte Varnish is a low-pressure 300ml water-based spray paint with a matte finish that is perfect for indoor or outdoor use. This spray paint comes in a wide variety of colors and can be mixed with acrylics while wet, yet permanent once dry. Montana Colors MTN Water Based Spray Paint WRV - Matte Varnish color is a clear matte finish varnish coat.