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Old 06-13-2017, 09:50 AM
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Bruce Sexauer Bruce Sexauer is offline
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Location: Petaluma, CA, USA
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Gorilla glue IS a closed cell polyurethane filler IMO. The process described by the OP would be a great way to turn an acoustic guitar into a high volume low feedback performance instrument, possibly even better than a toilet seat, but would have devastating consequences on the efficacy as an acoustic instrument.
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