I'm new to melt and pour soaping and I really want to create cakes and cupcakes. I have tried and tried to make frosting, but I can't get it. I'm using melted white melt and pour base and liquid glycerine (2 tablespoons per every 4 oz. of m&p) and then I whip it with a hand mixer. But EVERY time, it hardens as soon as I get started and just gunks up my mixer blades. There'sno way I could pipe it as its just a hard wad of fluff. What am I doing wrong?