Long term Glow in the Dark paint

It's only a little radioactive. Really. [Link]

MPK Co., a company that makes glow paint, is working on a technology called Litrospheres that allows objects to glow for more than twelve years without access to any light source. How do you make something that glows for twelve years? Chances are you have to use radioactive ingredients, in this case Tritium, which is far less dangerous than radium, but can still be toxic in large doses.
The company developing Litrospheres claims that they are non-toxic, inexpensive, and nearly indestructible.

Time for a new Tron costume.