Loctite Fast Grab not setting?

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Mar 24, 2006
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Hi everyone, I’m putting stone veneer on Sheetrock for my fireplace surround and using Loctite Fast Grab to do it. I dude the right side, no problems. Now I have one piece that I hung and propped before going to the store, thinking it would be set by the time I came back. I held it against the wall for about three minutes before propping it, which was enough on the other side. But 45 minutes later I gently pulled the prop and it immediately started sliding down. I gave it some more firm pressure and reset the prop (an additional hour ago, by now), but it still doesn’t want to set. Any advice before I pull it off and call it a day? I can’t think of where I went wrong. 71° inside the house, no dust, no water. Really scratching my head here. Appreciate any insight.
 
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