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I need to reattach(*) a large, flat, frameless mirror (about 8'x6') to drywall, and a few long/thin beveled mirror pieces around it as a "frame".

Two questions:

  1. What adhesive should I use? Epoxy glue? Liquid Nail?
  2. How to hold the mirrors in place while the glue is setting? (If the glue sets in a short time, say 10 minutes, then I guess I can simply lean on it while playing Angry Birds.)

* If you're curious why I said "re"attach, it's because the mirrors were there originally, and I removed them to open a small doorway on the wall. I was able to simply ply the mirrors off.

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Duplicate of diy.stackexchange.com/questions/564/… ? – Alex Feinman Jun 7 '11 at 13:39
@Alex Feinman: I don't think it's a dup. That question is about a much smaller mirror to hang on the wall, and the accepted answer (clips) definitely doesn't work here. Another answer over there is Liquid Nails, but all require additional support. – Geoffrey Zheng Jun 7 '11 at 14:22
Then maybe additional support is required. Otherwise you are effectively gluing to paper, and that's not going to have the strength you need. I would follow the second answer listed in that question in your case. – Alex Feinman Jun 7 '11 at 16:09
Be careful, sometimes angry birds fly into mirrors and hurt themselves! – Tester101 Jun 7 '11 at 16:54
If you can, test the glue on an inconspicuous part of the mirror. The prior home owners put up a wall of 1'x1' mirrored tiles and the glue had stained through the back of most of them. And pulling them off caused significant damage to the drywall. – BMitch Jun 7 '11 at 16:56
up vote 2 down vote accepted

Mirror Adhesive ("mirror mastic") exists:

enter image description here

As for how to hold it up; rest it on something:

  • the top of the backsplash
  • rest it on a strip of wood fastened to the wall

and use mirror clips while it sets.

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