by mattb » Thu Dec 15, 2016 9:10 pm
I think I use less rubber than Mark uses. Probably 2 pounds would do a full mold if you keep the box not more than 3/4 inch larger than the body on all sides. Inner shouldn't take more than 8 oz or so on a small 1/32 body. If the mold is small and sides too flexible, you can cut some wood or plastic to support both sides and put a rubber band around the mold to keep everything in place. Rubber on rubber requires a mold release specifically for that. Micro Mark has it in their catalog, Hobby Lobby has it on the shelf, and Smoothon has it on their website. It is a paintable release that keeps the silicone from sticking to silicone. Best to coat the whole outer mold and not just where you think rubber will touch rubber. This is not Mann Eze Release or similiar type product. I have tried and found that baby powder will also work as a release if it is dusted in a mold then the excess blown out. t does not cause interference with future painting. This does not work with rubber to rubber. Probably pictures would help you understand some of this process and if nobody puts anything up here, I will post some stuff in a day or two. So many guys cast stuff here that they probably have pix of every stage on their computers.