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While I was teaching we'd put a backer board on our bowl projects with a sheet of paper between the good wood and the backer to make separation easy. We did hundreds of bowls like that, and there were a few that failed and we had to reglue, but for the most part that worked for us most of the time. In the last couple years I haven't been able to make it work, the paper joint keeps coming apart while we're turning. Yesterday I got the kids going on the lathes and both of them had the bowl separate from the backer board. We reglued and we'll just have to work a little harder at getting them separated in the end. Is the paper weaker these days or what is going on?