Hi there, this is my first post on this very helpful site.
I can't seem to find much information anywhere about using rubber to make mold masters for recreating slipcast molds.
I have been experimenting with making rubber masters of my molds (mostly 2 to 3 piece molds). But I find that whenever I pour a new mold from the master, they don't quite fit together as well as the original.
I have experimented with a few different types of rubber, but am limited to products that don't need degassing.
Is there any one particular product that is recommended for use in this situation?
I've attached a couple of photos to show how I am constructing my masters.
The blue handle mold was made using Smooth-on Oomoo 25 (which is very soft), and the light colored one was made using Polytek Polygel 35.
Any little tips or tricks would be greatly appreciated.
TimPhone_20140314_001.jpg 56.97KB 4 downloads
TimPhone_20140314_002.jpg 51.14KB 2 downloads
TimPhone_20140314_003.jpg 51.93KB 2 downloads