A big problem with polyurethane glue is deterioration due to water vapor

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Hahahahahahahahahaha ...wheeze.. gasp

Good one, Orval, thank you. Best laugh I've had all week :-)

-R.S.Hoover

PS - Although relatively new in the United States urethane-based adhesives have
been used in Europe for the last thirty years or so, in the construction of
boats, houses and airplanes (for us common folk) but also for the repair of
antique musical instruments, the wooden tube of an antique telescope at Riga
and by the people who do restorations for antique furniture, firearms, coaches
(!) and so forth.

If you haven't tried it, perhaps you should. Or simply go read the FPL reports
on the stuff. It needs quite a bit of pressure to ensure a 100% bond with wood
but otherwise, it's a pretty good glue.

(Urethane foam degrades due to exposure to ultraviolet rays, not water vapor.)