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That's exactly what happened, and that could very well be the answer: old tape.
I didn't buy the tape at a high-volume outlet, like Home Depot. I got it from a
mom and pop variety store, which...

I just bought a roll of Scotch 700 (7mil) electrical tape for taping the spine.
I've used this brand before with no problems, but this time the adhesive
seemed to melt and run when used with honing...