Hot glue for spine rounding was a disaster for my last 3 rebinds

I thought I'd save time by using hot glue instead of PVA for rounding the spines on a batch of 5 hardcovers last month. Figured it would set faster and let me move on. Nope. The glue cooled way too quick and got brittle. Three of them cracked open when I tried to round the spine. Now I'm stuck redoing those three from scratch. Learned my lesson - PVA might take longer to dry but at least it stays flexible. Has anyone else tried a shortcut that backfired like this?

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