Montana Nightglow is a high-grade acrylic spray paint which contains luminescent pigments that store light (absorbed energy) and then emit light into the darkness, making them glow in the dark. The luminescent effect is only visible in total darkness and then length of glowing time is dependent on the intensity of the light charge and thickness of the paint layer. It is recommnended to apply multiple layers for best results. Montana Nightglow can be used for indoor and outdoor applications on a wide range of primed surfaces including; metal, wood, hard plastics, primed canvas and walls. Once dry acrylics are permanent and water-resistant. UK shipping by road only. Not available for international shipping.