Updated: May 19, 2020
After Steve spoke to a representative at mouldlife, I ordered silicon 2 part solution for casting my moulds. I chose to use silicon opposed to other materials for this project because I wanted flexible parts for my puppet.
I used hard cast resin in my first year, which worked well for that project. In my second year I used foam latex, which was tricky for me get right.
I haven't used silicon before, but so far I'm finding it a lot easier to use opposed to other materials so far.