Once I got glittering, I thought "hmm, this glitter feels an awful lot like grip tape, and you know adding griptape over the glitter would really take away all that great sparkle..."
One thing led to another, and lo and behold - glitter griptape!
I mixed some of the glitter into Mod Podge furniture Hard Coat, then scattered loose glitter all over while still wet. Once dry, I added several coats of Mod Podge spray super hi gloss, put the board back together, and voila!
He doesn't ride in the rain (generally a good idea) but otherwise so far so good.