To stop the clay from sticking to the plaster I use baby powder and sprinkle a coating on the inside of the mould. I then wipe out the excess using a dry paint brush, a technique I picked up from a ceramics class at university.
I only create a certain number of masks each year, usually around ten, depending on how much time I have. As I mentioned they are time consuming to make and may take me three hours to complete just one. Then there is the firing which I do myself, which begins with the initial bisque firing done in a home made kiln followed by a second firing done in a pit. There is something I love about pit firing, it is like a connection to the past and your'e using real fire.