Another thing I wanted to throw out there is the "old" info about needed pounds of pressure for glue to work? I had it in my mind, I think from Franklin, that you needed 150 pounds of pressure for it to do anything, and this is why we all rushed out to buy Parallel head clamps costing a LOT of money so we could get a good crush going with our up to 1500 pounds of pressure clamps, so they could earn their keep.

Hell I have made several boxes and all I used for a clamp was blue painters tape. Pretty strong, but the key thing is the glue did it's thing. 

Granted these are smaller projects, but why didn't tape get higher honors all those years ago?

I'm thinking a lot more important than pressure is how well the pieces to be glued mate to each other. So Approximation, is it the key? I do know I have been shooting more edges than I used to, and it seems to be a huge part of it. Tight going in, = tight going out.