How waterproof is it?
I just made a temporary 24" eavestrough out of scraps of 1x4 and plywood to get
me through to spring. Starting in a few days it will see constant water from
either heavy frost on the roof or melting snow.
It's not leaking now.
What kind of shape will it be in next spring?
This should be a pretty good test of the glue don't you think?
If anyone is interested I can post results in the spring.
Just to test the technique, I made a raft out of tongue and groved PT
lumber, glued together with TBII. I anchored it in a lake. 8 months later
it was good as new.
Never used TBIII, but if it is as good as TBII, you will be fine.
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