Poly glue is not a replacement for wood glue. It works great for certain things but should not be marketed the way it is. I build giant scale r/c airplanes and it is the best option for gluing thin balsa sheeting to foam cores. Myself and some others have done some extensive testing with the three most common types of poly(gorilla, elmers, and titebond). I prefer the titebond brand of poly for a number of reasons but I will not bore you with the details since none of them are least bit useful for guitar building.
In short...the materials you glue must be very porous and clamped or weighted down very tightly. I usually put over 250lbs of weight on a single wing panel to make sure the foaming action permeates deep enough(also use water/ammonia mixture to increase the foaming). Tight grained wood/most hardwood is not a good candidate...neither are plastics or metals(despite what the bottle says).
Anyway...Nice work RAD! This thread is awesome.
