I am trying to mold some of my sculptures that are the figurine type. they are made from an oil based clay with a middle support so they are sturdy. so my question is what type of mold is best ? sillicone mold, rubber mold, 2 part mold. i have been looking online for the last 2 days but i just cant find a direct answer. if any one could help i would greatly apreciate it.