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Yup, you might get better results from dental alginate or anything from Smooth-on, but it's tough to turn down the miracle properties of JB weld-it even captured the wood grain nicely! Total cost per mold: about two dollars.
I had a test mold of this stuff sitting on my desk at work, when one of the machinists happened by. He told some other folks about what I was up to, and it broke down into a contest between the engineers (who thought this was doomed to failure) vs. the machinists (who really liked the idea). Well, when the mold was pulled, and the remaining play-doh scrubbed away, everyone was amazed. I can see this being really handy for replicating knobs.
In fact, I forgot to mention that two of the Zenith "Z" stamped knobs were cracked and missing pieces. I built up the empty areas with JB weld, let them cure and filed them down, and they will look perfect when they are lacquered.
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