Vic-
Yeah, I use PU for the blue FFF electrics I've been building for past couple years.
With FFF I combo'ed PU joints with HotGlueGun spot tacks, to make quick builds with slow glue.

I was referring to the Elmers PU with the really grumpy looking bull on the bottle vs the happy cartoony cow on elmers white school bottles. The laid back monkey on the GorrillaGlue bottle just doesnt look like he is that committed to the cause... while the bull is ready to get it on!

Yeah, PU is not just gap filling,
it spans joint chasms, forms its own fillets, and dont let go