Easy the surface of the clay with a wet brush, then set four 1/4 " circular 1" long items of clay on the sleep to do something as secrets for the silicone. Set an item of clay on the top of the sculpture to do something as a pour spout (Sometimes the pour opening will soon be over the seam line. In that case, make sure you keep it start, never protect the serve hole)
Put a slim layer of Vaseline on the clay sleep and sculpture.
(Read and follow warning labels on all chemicals) Mix 1/3 glass of silicone with 2 tbsp of plastic cement together in a bowl. Should have the consistency of peanut butter.
Distribute the silicone on the clay sleep and sculpture. Do not cover the the surface of the pour hole.
Push 1 ½ square pieces of drywall mesh into the silicone. Recognize that people did not protect the fill hole.
Cover the mesh with a slim layer of you silicon mixture.
Cover dried silicon with coating of Vaseline. Then combine plaster into a pan with water, it should feel like pudding when effectively mixed. Then put a slim layer of blended plaster on the silicone molds for making soap lined surface of silicone (do perhaps not protect serve hole).
Check out soak 3x 2 items of burlap in blended plaster and place them on the plaster coating from prior step. Do not protect put hole. While the plaster continues to be damp, gently apply the top of the burlap with h2o and smooth out the surface.
Slice the clay bed free from your work surface with something sharp (never cut towards yourself). Change within the shape and eliminate clay bed from sculpture. The clay inside the key slots needs to be removed as well. Clear any remaining clay bits off.