Inadvertent Glue Test - Woodworking Talk - Woodworkers Forum
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post #1 of 4 Old 08-19-2019, 04:28 PM Thread Starter
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Inadvertent Glue Test

I did an Inadvertent Glue Test some years ago. It was purely unintentional but learning endeavor.

I had to pull apart some 2x4 glued to make legs for a frame. When I saw the results I did a glue test.
The test was two 2x4 glued together in a cross along the 3˝ faces. I did two and clamped each while letting the glue dry over night or so. One was Gorilla and water spray while the other was TiteBond III.

When I pulled the 2x4 pieces apart, the differences between the Gorilla and TB III was evident. With the Gorilla, about 80% of the surface was glue breaking apart and 20% wood fiber failure. The TB III joint showed almost 100% wood fiber failure and almost no glue failure.

Unscientific but exceptionally interesting.
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Rich
In furniture 1/32" is a Grand Canyon
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post #2 of 4 Old 08-20-2019, 02:00 AM
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Personally not a fan of Gorilla glue, never really gotten great result with it before. If wood glue won't work for a project I'll just use epoxy seems to work a lot better.



-T

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post #3 of 4 Old 08-20-2019, 04:00 AM
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I use Titebond III for basic woodworking joinery, just like most people. It is relatively inexpensive. It is strong. It is waterproof. It is easy to use and clean up, compared with nearly any other wood adhesive.

I use Gorilla Glue (polyurethane) to glue brass tubes into drilled holes in pen blanks, which are made of wood or plastic. I like it because it foams to fill the gaps (the holes are not always a perfect match, and may be a little rough. It feels hard, but with a little flexible "give" to it, so I believe it is less likely to crack from brittleness if dropped, compared with the more popular CA glue. I have not tried it for ordinary wood joints, but the foaming action would be annoying. Cleaning squeeze out would not be fun.
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post #4 of 4 Old 08-20-2019, 02:04 PM
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Polyurethane glues foam to fill the gap, but the foam has very little strength. Polyurethane glue performs well when you have a very good fitting glue joint, but when you have a glue joint that's a good fit, almost any glue will perform well.
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