Once students have sculpted what they want their masks to look like, they must make a plaster mold of their sculpture. The plaster mold must be thick enough not to break when cleaning out the clay, but also contain all of the details of the sculpture. In order to achieve this students apply two layers of plaster over their mask. The first one is a thin layer of plaster that captures details in the sculpture. The second one is a thick layer of plaster that ensure a strong mold and no holes.