Things You'll Need
Silicone molding compound
Cardboard or disposable container
Aerosol acrylic enamel
Liquid plastic compound
Disposable mixing cups
In the past anyone who wanted custom plastic parts had no choice but to go to a large manufacturer and pay an equally large fee. But today materials are readily available to produce plastic parts out of your own home for a relatively small financial investment. These parts are just as high-quality as parts created in a large manufacturing plant, but offer the ease and comfort of working when and how you want to.
Making the mold
Use hot glue to attach the object to be molded to a flat working surface.
Cut the bottom off of a disposable plastic container and set it down over the object. If the object is an unusual size or shape, use a strip of cardboard instead. There should be at least 1/2 to 1 inch of room between the object and the walls of the container.
Glue the container to the working surface to make sure none of the silicone leaks out.
Spray the object with 2 coats of acrylic enamel.
Mix the silicone in a mixing cup according to its directions.
Pour the silicone slowly into the container at the lowest point and allow it to cover the object. If you pour the silicone from high above the container any small air bubbles will break as it drizzles down. Fill the container to 1/2 inch above the highest point of the object.
Allow the silicone to cure.
Making the parts
Remove the plastic container or cardboard and clean the mold of any residue left by the object.
Brush or spray a liberal coat of mold release into the mold and allow it to dry.
Mix the liquid plastic in a mixing cup according to its directions.
Pour the mixed liquid plastic into the mold at the lowest point. Allow it to fill the mold.
Remove the plastic part from the mold once it has hardened and make as many more as you need.
Mix liquid plastics in a well ventilated area to reduce the danger of fumes.