MTN Water Based 300 Spray Paint - RV29 - Phthalo Blue Light is a low pressure 300ml water based spray paint with 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 RV29 - Phthalo Blue Light color is a full light blue hue.