Wait, you used raw honey? Not even the processed squeeze bottle stuff? Raw honey still has all the pollen and enzymes and moisture in it, that's the whole point of it. That tacky spot you're feeling is probably where it never fully cured, because honey pulls moisture out of the air instead of drying hard like glue does. I'd bet money that spine gets soft again once your place gets humid, and yeah the ants will absolutely find it. You basically glued your book with sugar bait.