Inject tube baits with Powerbait sparkle. Might make your own and add additional glitter. Try refrigerating or even freezing to slow down release, or thinning paste to speed it up. Might be faster to do some baits up beforehand. Seems like it might be easier to change baits than trying to add additional paste to the tube on the water.http://www.thebaitpump.com/
Might try adding glitter to some of the gel fish attractants and see how well that holds and disperses glitter.
I remember my dad and I discussing taking the skin from our crappie filets, freeze them on a baking sheet, running them through a blender, pouring them into ice cube trays, and freezing them. Drop them over the side as a feeding stimulant. I don't remember ever doing it.