Top positive review
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The master of temporary light mountings
on April 22, 2013
This (apparently somewhat iconic) gum-like substance is a reusable, pressure-activated glue. It's no good at holding up heavy things, and it seems optimized for vertical (on the wall) mounting, but when it comes to holding up a few ounces of something on a wall or door, it's pretty impressive. I use it primarily to temporarily attach things to walls before pulling up my screwdriver and mounting them permanently.
As always, do bother to read the instructions. All that kneading and pressing really does make a difference. Don't assume it's obvious. And do roll it off the wall when you're done, don't pull.
Oh, and a little bit of this stuff does go a long way. Don't overdo it.