Yes, it fades fairly quickly. I was thinking about filling a Farnell transparent button with it for the new face. I think it would give an edge lit effect with a glowing center. I've also got some phosphorescent powder that I'm going to try mixing into some silicone that way you get the translucence and the glow.

Have you heard anything from Casting_Fool lately? It'd be nice to have someone with more experience solving this one.