If I mix these two together, what measurements should I use in order to layer an 8-inch round cake that has 3 layers, and what do I use on my mat in order for the fondant not to stick to it. I know you use shortening for fondant and constarch for the clay, but when mixed together, what keeps it from sticking to the mat, and what do I use to adhere candy clay decorations to this, or should I use gumpaste or fondant molds?

I have been using a 50:50 mix of candy clay and fondant and treating it exactly like fondant ...no probs