Urethane glues - info
Posted: Tue Mar 06, 2001 4:35 pm
Finally a subject I know something about!
Polyurethane glues (common trade name of a good one is Gorilla Glue) are
excellent in applications where there is or will be moisture. They are
essentially activated to cure by moisture. It's important to not use too
much glue - it expands as it dries. It's critical for joints to be clamped
or fastened tight together with fasteners as the glue cures; otherwise it
will force the joint apart.
The excess glue does "foam up" at the joint, and it's easily cleaned off
with a sharp blade or rasp after fully curing (or you can cut it off after
it's tacky and before setting fully). Remember that the foam part, while
hard, has no adhesive holding strength.
The glue readily cleans up with alcohol (denatured, not the drinkin' kind),
and it's best to apply it with a small brush (such as an acid brush). I
usually pour a small amount of glue in a small container and use the brush
to dip from this.
Activation of glue and better tensile strength can be accomplished by
lightly wetting one surface of the joint before assembly. I usually dampen
one side with a wet paper towel, then coat both mating surfaces lightly with
the glue, assemble, and clamp.
Gorilla Glue has a good web site http://www.gorillaglue.com/
My last large use was for 2 bedroom suites - before that it was the 32
cherry doors for my home. I'm used to and like this glue better than most
others I've found. If I were repairing/rebuilding a tub, it's what I would
use.
Tom Wilson TC0272