Epoxy test on youtube

Sort of interesting, not sure how valuable. I couldn't read the labels on the epoxy packages to determine the PSI or suggest usage.
 
The one thing I saw as a flaw in their testing was that they used socket head (Allen head bolts), which made it easy to not get the same application to each bolt due ot the void in the socket area. As to which one would be better in a controlled lab test I do not know, but am a firm believer that nothing works as good as advertised.
 
A lot of uncontrolled variables there.
- all mixed per instructions
- applied the same
- cure times
The last to fail was one of the longer cure times and looked like the biggest blob of material.
 
I don't know the difference between a torsion test and a tensile test. My test is; does it hold?

Unfortunately, the only thing that video proved to me was their ability to waste time and their ability to make a bad video documenting it.
 
The tests show that epoxy breaks away from the surfaces to which it is adhered. The usual approach with epoxy on smooth surfaces is to scratch surfaces so that the epoxy can adhere to the tooth, to create strength in the epoxy through additives such as fibers, to build up the epoxy at the joint through filets. Big filets do better than small ones. Fiber laden epoxy + filets + deep scratching do even better. I didn't see how they really did more in the tests than show that the epoxy let loose on a fairly smooth base. Not a useful test for me.

I use epoxy to join wood to wood in boat building. Not metal to metal as some here do to repair engine cracks/breaks. My epoxies (none of the tested brands) soften when the temperature rises...so that hot surfaces (as on boat decks in the tropics) do well to be coated with reflective paint. Temperature rises on a Cub are obvious when around the engine/transmission. Personally I'd opt for metal to metal connections such as welds, bolts, etc. Otherwise, not having used JB Welds, I have heard that they work...but I'm not sure of the circumstances.
 
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