I'm not used to silicone molds, but I recently got a pie crust and an insert mold from Van Yulay. Anyway, I have tried two different types of paraffin, tried different pouring temps, cooling temps, curing times, etc and still have this horrible white "frosting", for lack of a better word, on the surface. What am I doing wrong? Do I need to heat up the silicone mold before pouring like you do sometimes with metal molds? Soooo frustrated... :undecided