A special spray gun (called a dry flake gun):
Which makes things shiny!!!
I'm not a massive fan of big flake or shiny stuff like this, but Melissa loves it, any time we're at a car show there could be the biggest piece of **** car but if it's got flake on it she's thinks it's the best damn thing there. Either that or anything purple/pink - so the back of this guitar is purple/shiny and the airbrushing has a pink flower on the front - its a win win!
The trick to doing this is keep the dry flake gun air pressure really low, as in only 5 psi, get a couple coats of clear on WITHOUT heat lamps so it's nice and soft, then when you shoot the dry flake into the clear it swims around in it, but you have to be really careful of your technique otherwise the chunks of flake can pool up and look like ****. Once the flake is how you want it, shoot more clear, you'll notice the flake move just that tiny little bit when the new clear goes on and you may have to come back with the dry flake gun and touch up some areas, very careful not to make patchy areas of flake that seem more crowded than other areas. Once you're happy, bang on the heat lamps so it bakes then smash on heaps more clear.
One side effect of a dry flake gun is sometimes you walk out of the booth nearly as shiny as the object you just sprayed!