Norm II wrote:
Man, I used this stuff for the first time, last week, and have seen
nothing like it! Ease of use (no mixing), and strength. I glued a scrap
piece of 2 X 4 together (90 degree angle) and when set-up, I could not break
the joint!! I had to swing it "sledge hammer" style to finally break the
test piece...and you probably guessed what's coming next...It did NOT break
the glue joint, but the wood around it. Any reason NOT to use this in place
of epoxy for adhesive when building the frame work for my "Glen-L ZZZip"???

There are a couple of caveats with PU glues. To get any the maximum
strength out of it, it must be prevented from expanding. If allowed to
foam, it loses nearly all its strength. So:

1) The parts to be joined must be carefully fitted. Gaps must be kept to
an absolute minimum. Do not use PU glue in gap-filling applications!

2) The parts must be tightly clamped, otherwise the glue will expand and
force them apart. I've also found that PU glues are very slippery and
parts will tend to move in relation to each other unless they're
carefully controlled.

Whether this fits with the project you have in mind is for you to determine.

You've noted some of the advantages of PU glue and I'll add one to the
list. It doesn't damage cutting tools the way harder glues like epoxy can.

Huh?

I do my epoxy gluing with wood flour thickened System Three, and, to the
best of my knowledge, it cuts like wood. ("Wood" covers a broad range of
characteristics.)

What brand of epoxy is hard enough to damage cutting tools?

Roger

http://home.earthlink.net/~derbyrm

"Brian Nystrom" wrote in message
news:GkRwe.11950$JM6.6541@trndny05...

You've noted some of the advantages of PU glue and I'll add one to the
list. It doesn't damage cutting tools the way harder glues like epoxy can.