I am a mask maker and often make ultracal molds on Chavant NSP Med. Sculptures. I crystal clear them, several fine coats, the night before I make the mold. I have recently started using a bit of dulling spray for tooth before I do the detail/splash coat. Sometimes I can pull the clay cleanly from the mold after it has set, but most often I have to dig quite a bit out of the recesses with wood tools. I then slip cast neoprene rubber into the mold but the first pull is usually corrupted by impurities on the mold surface, which I then clean with acetone and then castille soap with a trimmed chip brush.
My question: What process do you people use to prepare/release your sculpture before molding, and how do you clean the ultracal surface afterwards to remove impurities.
My method gets the job done, but I am always looking to improve my process for speed and quality.
Mark A Schneider
Faust & Company Masks