Some of the most famous modern sculptures have been made out of silicone that is cast from molds. Artists such as Ron Mueck have spent a lifetime experimenting with the medium to create hyper-realistic creations that shock and amaze. But silicone rubber has many other advantages to sculptors beyond its ability to fool the eye. Often silicone is used for sculptures when the use of stone or metal is not considered safe. Silicone sculptures are softer and lighter than those made of other materials.
Brush or spray a generous amount of mold release into the mold, choosing the proper mold release for the materials you are using.
Bolt or strap the mold together, if it is a multiple piece mold.
Mix a small amount of tint into the silicone, if color is desired. Mix the silicone rubber components together in a bucket according to the directions.
Place the mold on the floor. Pour the silicone slowly into the mold, holding the mixing bucket as high as you can. This will cause any small bubbles to break as the silicone dribbles into the mold. Fill the mold to the top.
Remove the silicone from the mold once it has cured. Different silicones have different cure times, but you will know it is ready if it is not sticky to the touch.
There are two main types of silicone rubber: Platinum Cure and Tin Cure. Platinum Cure, which contains actual platinum, is used for medical and makeup prosthetics that must be safe for skin. Tin Cure is the best option for sculptures as it is far less expensive than Platinum Cure.
Pre-made molds and silicone rubber can be purchased at craft stores, art stores and special effects supply stores, or you can make your own.
Keep silicone away from fabrics and carpets, because it cannot be easily removed.