Re: adhesive info and advice pls

Tim W wrote:
When I learned woodwork there only was a choice of two glues. Now I
need some info about alternatives. This is what I am doing:

Involved in the restoration of a very old building I am repairing oak
window frames. A long job of scarfing and letting in new pieces of
oak and jointing in new sills. I was using pva but the recent low
temperatures have given me a lot of grief. The night time
temperatures in the barn/workshop are around freezing and the glue
doesn't work.

I don't like the idea of Cascamite (urea formaldehyde?) because I
need a lot of small quantities of glue through the day, so I don't
want to mix up a batch with a short life. Also I was keen to have a
little movement in the glue between the old and new timber. I have
never used polyurethane or epoxy or animal glue or electric glue
curing devices and there are probably other options I have never
heard of.

Seeking knowledgable advice or web pages/pdfs. Low temps, small
quantities, weather resistace, old to new. Clamping times are not an
issue, brute strength is not an issue, joints can be made reasonably
close but they are hand cut and often saw cuts to be glued so there
is gap-bridging and crack filling to consider.

No real recommendation here, just mind doodlings...

My favorite general purpose glue is TiteBond ll. Water resistant,
reasonable flexibility but doubt it would be good in low temp (fine
after setting). TiteBond 3 is totally waterproof, same reservation.
Both need reasonably good joints, wood to wood.

For gap bridging, epoxy with the addition of Cabosil as a thickener is
wonderful. Very strong, no clamping needed, waterproof. However,
useable pot life is short - if you don't like Cascamite's you would hate
epoxy's. It also requires warmth (60+) to cure - that could be fixed
with a space heater? You mitigate the pot life by cutting a bunch of
joints, mixing some epoxy and gluing a bunch at one time. Good
source...
http://www.uscomposites.com/

In lieu of epoxy you might be able to use polyester or vinylester. Pot
life is very short (variable depending on how much catalyst is used) but
that could be an advantage since you could use a hot mix and not have to
worry about low temps...unlike epoxy which gradually sets up over
several hours, they set up very rapidly once they start. Same source as
the epoxy.

There is also polyurethane glue. Needs moisture to cure so the low
temps might kill it for you. It is good at bridging and is strong but I
personally dislike the stuff - it foams.

--
dadiOH
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