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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. Thanks