That expensive bookbinding glue I swore was a gimmick
I've been using plain old PVA for 15 years, so when a guy at the shop in Portland kept pushing this $22 jar of specialty glue, I figured it was just marketing fluff. Last month I had a run of 30 hardcovers where the spines kept cracking after a week, and I finally gave in and bought a jar. I glued up a test batch of 5 books, left them in my car for three days in 90 degree heat, and not a single spine split. Has anyone else been burned by a product they thought was overpriced?