Thanks Mark
I am going to give a 2 part mold a try using solarez. I will try to see if I can do one half in plaster of Pari s and then solarez and after it hardens chip away the plaster from the master and then cover with Vaseline and do the other side with with solarez. If that works I want to try using it also on foams and other hard curing resins as I find that molds made of silicone expand with foams and doesn't give exact copies every time.