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Other uses for polymer concrete have spun out of its use for counter tops, which can be large enough that cracking becomes an issue.  Hearths, sinks and even Roman style tubs have been constructed of this material.  Variations in the aggregates, reinforcements and polymers have resulted in a fairly stable material that might also be used for speaker enclosues, and mold shapes keep getting more elaborate. There is no doubt that this stuff could be used for horns to good effect, and some aggregates treated right might yield surfaces that required mimimal further finishing.  At the same time, it is possible to build up this material, so fine tuning - in the + direction at least - would likely be pretty easy.  Grinding it is possible, too, but not so simple.  Shrinkage of modern polymer concrete is minimal to negligible.  Lightweight aggregates are also in widespread use, along with ground glass and other materials chosen to enhance finished appearance.

Best regards,
Paul S

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