There is a permanent, heat-proof, somewhat higher tech material that I use for potting. It's a soft polyurethane with just the right resonance to work, and it's permanent and protective to boot.
It's called F-25, and it's pretty good--low odor, easy to mix, not too toxic (non-toxic once cured). It's only available in pints, however, so you'd have to pot a lot of stuff to make it worthwhile. But it works very well to cancel resonances.
If this interests anyone, drop me a line and I'll tell you where to get it.
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