I have some ultracal molds that I need to pull hard copies from so I can clean up and remold to cast in a different material than what I have been using. I have heard I can put in fiberglass and break the molds open which would leave me with a FG copy of the piece. Since, obviously, this is a very risky procedure I need to know the best way to go about doing this and the materials to use. Any help you guys can give me who have been doing this a while it would be a great help to me. Thank you for all your input.