RUBBER MOLDS are generally made to produce a wax for the casting of a bronze, or used for making multiple copies with other materials like plaster or resin. There are many types of rubbers; polysulfides, urethanes, and silicones to name a few. The type of rubber one chooses is dependent on what original material one is molding, and what material will be cast from the mold. For some reason, the manufacturers have never created an ideal rubber mold compound that works great for all materials. So you must do your research.

I will try to demonstrate with the photos below, how a rubbermold can be made. There are several approaches to making rubbermolds. You can paint, pour or parting-line (pour one side then pour the other side). For the demonstration below I chose the latter, since it gives you the sharpest parting-line or finest seam and the best rubber to rubber registration. I look forward to any questions or suggestions. If there is a good response to this page I will continue to add more.