I used this to hang a photophone in the garage. I didn't use any glue at all, so I can't comment on that. They flew out of my hands when I went to pick them up, the attraction was so strong! Luckily I have a corrugated iron garage, otherwise I would never have taken it down. I had to move them into the beveled area to get a grip to take off. There's no complaint, as if it wasn't strong enough to hold up the way it is, which is perfect for a good weight. Amazing product. I keep it for other uses and know what else will come in handy.
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