All of the miter joints actually ended up with mostly wood failure good instead of glue failure bad . for end grain joints. For this reason historically we have used mortise biscuits etc.

If you do glue it and have enough adhesive end grain is really absorptive you can develop some strength but not as much as with side grain.

Woodworking It is like trying to glue the end of a bundle of soda straws to the end of another bundle. Gluing end grain without some sort of special joint such as a spline is next to impossible. Seasoned inventive woodworker Jeremy Broun puts the world s best glue to the test comparing Titebond 3 with Titebond No Run No Drip with Cascamite for end All in all it s usually best to find a way to End grain joints are notoriously horrible glue joints in any other world but in the super glue world the joints held up great. End grain is also notorious for sucking up glue like a bunch of straws and simply starves a joint of glue. As this answer explained .

About the only place where wood glue alone isn t very effective is on the end grain of boards. When glue is applied to end-grain the grain acts as little straws and draws a lot of the glue up the wood away from the joint similar to how the grain draws water up the tree when the tree is alive . Do you mean gluing of end grain or wood with quite a bit of end grain such as a 45 degree miter This is the direction that the tree grows and the fibers of the wood soak up moisture and nutrients for the tree to grow. Reading Is glue the best permanent join And How can I join two boards at the ends It sounds like the consensus is that gluing end-grain just doesn t work well.

He brought in some samples and glued them right in front of our eyes

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