by Tony Segro RTV (Room Temperature Vulcanized) Rubber molds are simple to make and can allow you to cast several identical detail castings for your scratchbuilt models. RTV Rubber is a two-part mixture made by Dow-Corning. It comes in various styles. I find 3110 the easiest to use because it does not require an expensive vacuum pump to decompress air bubbles. Take the detail you wish to copy, called a MASTER, and glue it into a cardboard or styrene box with dimensions about one inch longer than the master by one inch wider than the master. When placing the master in the box, you will … [Read more...]