I got my Smooth-On OOMOO 30 RTV Silicone, and made a new Hirst Arts starship walls mold.
It mixes 1:1, sets in 6 hours and claims not to need degassing. Plus, it didn't cause any noticable shrinkage, so I have to say I'm pretty pleased with it. I had more problems with the rubber seeping under the master pieces, but I wasn't as careful getting the pieces flush this time.
You can see I also added some 1/2" wide pieces to secure the walls to.
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