[David G4EBT]

It's the moisture content of wood which causes PU glue (such as original Gorrila glue) to cure. The instructions tell you to dampen the wood. The instructions so say that you need to squeeze the bottle to exclude air after use. It's favoured for repairing loose joints on old furniture as it expands on curing. I've not used it - I generally use Titebond, aliphatic adhesive, colloquially known as 'yeller'. (There are several types of Titebond).