At a guild meet in St. Louis, a binder told me my use of PVA glue was 'amateur' and that I should only use animal glue. I still think he was wrong. | Bookbinders - Librear
That binder at the Archon meetup had a point about animal glue. It stays flexible for decades, which PVA just doesn't do over time. Maybe he was rude, but the old school method has real staying power.