What does everyone use to adhere the fondant to the cake dummies? I saw on GSA that there is a permanent icing available, however I don't make many dummy cakes and can't justify spending $50 on a gallon of it. Can regular buttercream be used or royal icing? Thanks

You don't even have to use icing, you can just get them damp (NOT wet - just damp) with water and that works just fine.