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I've tried this with one-part high temp silicone RTV (both thinned and unthinned), but I was unable to open the mold after curing without destroying it and the silicone. I tried using Smooth-On Mold Release and degassing in a vacuum chamber - no luck. It seems the silicone sticks to the mold too well.
I'd try the 2-part platinum-cure silicone, but I haven't found one with a high enough temperature rating.
Is there some secret technique I'm missing?