Hi, I am not so used to M&P and want to know how much I would need to cut for my mold. I have several silicone molds I want to use for my M&P but they are all different in sizes and shapes. I don't want to cut up too many pieces and let them be wasted, or I don't want to have shortage in order to not fill the molds. How do you know/calculate how much base to cut for that specific mold? The mold only shows the dimension and not how much it can hold. I poured water to see how much it can hold and one cavity holds 3.4 oz. If I times that by the number of cavity, will that work? e.g) 3.4 x 6 cavities = 20.4 oz Do I cut up 20.4 oz of the base (or maybe a little more to be safe)? Thank you.