re: Sencond Gen Cutting board 45/25

David, from what I know, you apply a dab of glue so it is absorbed into the end grain.
You wait just a little ( a couple of minutes) then apply glue to both surface and proceed as usual.
That little glue on the end grain seal it a bit so it does not absorb the final glue and weaken the joint. I have seen it in many videos and readings. That does not mean these people are an authority on the subject.