I have several different silicone molds & most of them turn out ok but I have two pumpkin molds...one from flexiblemolds & one from candles&supplies. Both do that frosting thing. I have tried cleaning, heating the mold, pouring hot, medium & cool. Cooling slow, cooling fast & nothing helps much. 185 seems to be a good temp...sometimes! I'm wondering if it isn't something to do with what the original object was that the mold was made from? btw...my two pumpkin molds are of different materials...one blue silicone & one yellow...so that doesn't matter! Wish I knew the answer too. Maybe someone will come along with one! Julie