One method I've found for getting the sparkly finish is to deliberately spray a clear coat from too far away, so that it's already partially dry when it hits, creating a grainy/powdery surface that diffracts light. Using clear, not white, is the key.
Takes a little practice though. If you're too close, the spray will be too liquid when it contacts, and you get a solid "orange peel" surface instead of a grainy/powdery one, and if you're too far away, the spray dries too much before landing, and you get graininess that rubs off with handling.