On Aug 11, 5:12 pm, wrote:

Is this stuff waterproof?
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Dear Dan,

You've really got to test it for yourself. For top quality joints use
the set-up procedure recommended by the FPL. The instructions on the
package are rather whimsical.

While all urethane adhesive use the same general formula, the
composition varies from one manufacturer to another. The glue cures
by reacting with moisture in the air and on the substrait. The
reaction generates bubbles of carbon dioxide. Formulated for a fast
reaction, the bubbles will tend to be larger than a glue formulated
for maximum strength. The bubbles are closed cells except at the
unrestrained surface, where they may join.

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Is it a urethane glue like Gorilla,

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No. Tightbond III is a vinyl-resin glue, similar to white carpenter's
glue... except for being gray... and being CROSS-LINKED. That means,
once it cures, application of heat & moisture can not reverse the
process.

As for being waterproof the answer is a bit of surprise. Immediately
after application you can remove the glue with a lot of elbow grease
and a damp cloth. But the longer is has time to cure, the more
impervious it becomes.

If you're building with wood you owe it to yourself to give it an
honest test. I think you'll be glad that you did.

-R.S.Hoover