Never been a fan of Gorilla Glue

I did a presentation on joint strength a year or so ago.  There were three important points:

 

1. There are different types of stress on a joint -- Compression, tension, shear, cleavage(splitting apart), and racking (aka rotational, bending).   Some joint types and glues work better on some than others.  For example, CA (Super-) glue has very good tension strength, but less shear strength.  ATSM does shear testing for glue strength.  Most of the Youtubers I've seen do racking tests on joinery techniques.

 

2. Even with wood joints, there are different (grain) orientation of materials in the joint.  This affects the strength of a joint and which tuype you should use.

 

 

 

3. You have to ask, "Is it good enough?"  You don't necessarily need as strong a joint on a drawer back as you do on a drawer front.  And even that joint does not need to be as strong as a chair joint.

Thanks Dan...provides some interesting insight even if not in a controlled test environment & method. To me, the "impact" test was of little value since no valid measurement data could be derived.

The cylinder head test really proved nothing either since both products were tested on different engines, unknown static compression ratios, cylinder combustion pressures etc.

That coupled with the fact he created two uncontrolled flying projectiles...I would have least used a couple long bolts or all-thread with nuts & washers to contain the heads but guess there would be no drama to entice viewers.

 

Anyways, I've always been a big fan of J-B Weld particularly for metal repairs. I had a small porosity "burn through" on one of my boiler cast iron burners several years back. It was not in an area where the flames exited. I used a couple size drill bits to slightly enlarge, deepen and bevel the opening, then thoroughly cleaned with Brake Cleaner and dried with clean compressed air. Used the J-B Weld; once fully cured, cleaned excess with a Dremel and stone....it was difficult to tell a repair had been made. It continues to hold perfectly...if I had not marked the spot and which burner, it would be nearly undetectable.

 

I was amazed at the J-B shear strength power on the PCV pipe butt joint test as well as the torque shear test he did with the bolt heads fastened to the plate steel.

I also watched the video some time ago and as the guy presenting the comparison said the Jb weld is the only 2 part solution like epoxy in the test.. But I also have use JB for a long time and use it over all the others in the test.. When I bought this last back-hoe the housing around the fan blade was busted in a few places. I used JB Weld along with a few thin strips of metal for reinforcement and it is still holding like the first day I fixed it... That housing was like 200.00 if bought new...ho ho for JB Weld...

JB is my goto glue....