Sealing plastic guitar

[meankitten.livejournal.com]

My bf and I are painting our Guitar Hero controllers, and his is the guinea pig (the back first!). So far we've done two base coats of red and one coat of red glitter. we're going to do another coat of red glitter and then we want to seal it all with a high gloss/shine topcoat. Any suggestions of something specific to use? We can't really use a spray because the front has delicate hardware/buttons.