I've also had very good luck mixing it with oil based polyurethane. The oil base is important for the colors that are not water compatible. However I think that these varnishes don't dry completely clear like the nail polish in that thread so there may be some loss there, but not much.
I used a can of white gloss spray paint for the backing and not white out, this also worked just great.
I think those proportions for mixing are just right though.
It's not as complicated as it may seem, you just need a white background, a clear medium to suspend the glow crystals and then a final coat on top to protect them from rubbing off. I have even painted things that are completely black, like the head of my streamlight 3n and it glows just fine for finding it in the dark, it just won't light up the room that way.
-James
