Well, I already have the ModPodge in Matte and I think I have some Gloss hanging around somewhere, too. Been wanting to try the satin, glad to hear it works well.
I've been having the darndest time with paint though! Nothing seem to want to adhere well to my sculpted areas. Do any of you have this issue? I finally taped up the pony and sprayed the sculpt with krylon primer, and that seems to have worked.