Wow, my buddy tried that wheat paste only rule on a beat up cookbook and the spine split again in a month. He switched back to a simple pH neutral PVA like Jade for those everyday fixes. Some purists just live in a different world.

My last "waterproof" bag turned into a sponge on a day hike near Forks. Ended up reading a soggy blob that vaguely resembled a topo map. I've just accepted that nothing is truly waterproof here, only water resistant for a disappointingly short time.

Buddy of mine had that happen, used a hair dryer.