The intensity and length of the glow period depends on the thickness of paint layer applied. It is recommended to apply multiple layers of NIGHT GLOW over a well-primed white surface. The glowing effect will be strongest immediately after charging the painted surface with a strong light source and then exposing the painting to complete darkness. This paint works great for indoor and outdoor applications. It is suitable for all smooth, rough or light responding primed surfaces such as metal, wood, hard plastics, primed cardboard, walls and more. It has limited resistance to weathering, light and UV-influences. To improve resistance, it is recommended to varnish the finished piece with Montana Varnish Gloss (MXT-T1000). NIGHT GLOW works the best with any of the Montana Fat Caps.