Mold Making

So I'm making molds to get the perfect thing to cast in silver. Pouring Plaster of Paris over FIMO is a bad idea, as you will not get the FIMO out successfully. Also, then pouring plastic into POP is also a bad idea and now I don't have my skull mold I made. It was a fluke I made one that good to start with.

Also, old silicon sucks without a vacuum chamber. I got some new stuff that doesn't, but it's tensile strength is very low so molds won't last very long.