Check this out...

"Sealing Layer

Zinc or Silicate based Glow in the Dark Paints usually do not need a sealing layer. Aluminate based products like the Ultra, High, and Daytime series have their longevity and durability greatly increased with a sealing layer.

For this layer, choose a clear solvent-based paint that has no UV-filtering additives. We highly recommend Krylon Crystal Clear Spray Paint. It is inexpensive and available at many local stores. It is also available in gloss or matte to match your tastes. For a higher end product, you can also use our clear medium for this layer.


Here;s where the quote came from. Straight from the horses mouth as it were.

http://glowinc.com/glow-i...n-the-dark-painting.aspx