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For many years I have heard people using things like Salt and Sand as a medium between 2 boards being glued, to help eliminate the slippage that happens when we try to glue boards together. I have never used the technique but recently I have had a flurry of people asking me if the using Salt as a grit when gluing boards together, does that weaken the joint?
Watch it on Youtube: https://youtu.be/1Ai-IQvRDo4
It sounds plausible that it might, but it could also strength the joint ... or it might do nothing noticeable, but I will never know if I don't test it, so that's exactly what I set out to do ...