I'm planning on being C.C. at next year's cons, and I was going to use something like these (http://stageandtheatermakeup.com/bnpalette.htm) since I need to also color my eyebrows green I figured I'd buy a facepainting set. ^^ I've found with other kinds of makeup that if you put some sort os foundation under it, it will stay on better. I think I'm going to coat my face in skintoned foundation anyway, since I have freckles to hide, so I'm not anticipating any big problem with it staying on, but if it doesn't work for my test runs, I'll get a makeup sealer (http://stageandtheatermakeup.com/bnseal.htm) (and, definitely, a strong makeup remover. XD)
(no subject)
Good luck with your cosplay!!