These molds are made from plaster of paris. They start out as positive clay models on a board. From there they are sprayed with one coat of clear acrylic.. The board around the clay is then coated with Vaseline. This keeps the plaster from molding to the board or the clay. After the plaster dries, the molds easily pop off, which leaves you with negative molds. Once this is completed, casting latex is dabbed over the molds with a makeup sponge. Layers are added, making the middles thicker than the edges. Once they have dried, they are powdered as they are taken off to prevent the latex from sticking to its self. These prosthetics are usually added to the face or body as smaller effects. Some work together to make bigger illusions, like cheek bones with a brow bone to change the details of an actor's face.
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