I was thinking earlier (I know, that's dangerous), and I work on printers for a living. Laser printers use static electricity to stick toner to the paper, then heat the toner to make it bond.
This sounds a lot like powder coat, but possibly thinner, and with maybe a little less heat.
Has anyone actually tried using laser printer toner as a PC? If not, I may have to give it a try, as I throw away a LOT of black toner in any given year, and just emptying the waste toner bottle on some printers could easily give half a pound of the stuff.