To cast multiple prop guns, PMC® 121-30 is an excellent mold rubber choice.
The material is low shrinkage, easy to use (1:1 by volume mix ratio), and self de-airing.
This application illustrates a cavity pour mold, with a gypsum support shell. Ease
Release® 200 is sprayed into the mold before the pigmented Smooth-Cast® 325
The closed mold - notice the legs to hold the mold in a pouring position.
The opened mold. One half of the rubber has been pigmented darker.
The original model and opened mold.
Notice the small rod, used to create a hollow gun barrel.
The surface detail captured is perfect.
The resultant castings reflect perfect detail as well.