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Thread: Fixing a mirror into a frame
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21st April 2020, 05:18 PM #1SENIOR MEMBER
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Fixing a mirror into a frame
I need to fix a mirror into a rebated frame. There will be plywood backing board behind the mirror. Because I'm very clever, I didn't give myself much room in the depth of the rebate or thickness in the frame of the mirror to use a mechanical fastner other than some tiny nails. There is about 10mm from the back of the mirror to the end of the rebate, which will be filled with a 6mm ply back then a 6mm cleat glued to the back.
I was thinking some construction adhesive or one of the hybrid adhesive-sealant products would be the way to go. My main concern is the silvering on the mirror being discolored by whatever adhesive I use - any advice on products that have worked for you would be appreciated.
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21st April 2020, 05:29 PM #2China
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I have always used Loctite PL 520 or Sellys also make a version of liquid nails that is mirror safe
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21st April 2020, 06:00 PM #3Taking a break
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Neutral cure silicone
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21st April 2020, 06:02 PM #4
There is mirror glue out there, I think?
But basically you need a non acidic glue for the reason you pointed out, that it will show through the silver on the mirror.
Double sided tape might also work.
Cheers Matt
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21st April 2020, 06:40 PM #5
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21st April 2020, 07:25 PM #6GOLD MEMBER
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As stated by others, neutral cure silicone is used to hang frameless glass mirrors to walls in most new homes and you need to smash them to get them off or if you are lucky can cut them off with piano wire.
If you are still concerned have a look at the various silicones on offer at the hardware store and you will see that some are noted for mirror use.
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21st April 2020, 09:56 PM #7GOLD MEMBER
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I would not use a backing at all nor would I use any adhesive/silicon, doing this may cause condensation between the mirror and ply and thus deteriorate the mirror. All that is needed is some 12mm brads pressed (finger pressure) against the back of the mirror and tapped in to the frame say 3 to 4 brads per side... it ain't going to go anywhere.
Experienced in removing the tree from the furniture
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21st April 2020, 10:05 PM #8SENIOR MEMBER
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Thanks for the confirmation gents. A neutral cure silicone it shall be.
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9th May 2020, 11:42 PM #9SENIOR MEMBER
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The mirror is going next to the front door so I don't think condensation will be a concern. That said, I have left gaps where there is no silicone or liquid nails. Unfortunately my black bean stock was a bit warped so my finished thickness is around 9mm for the frame. I've got another mirror that I hung using keyholes in the frame - but with this mirror I wasn't sure that the frame would be able to support the mirror just by itself as the joints in this one are mitres with (small) dominos and the keyhole frame had bridle joints at each corner. Hence my wanting a backer board and a cleat to hang the mirror, so the weight of the mirror can be spread out over the 1.2m length of the frame.
In case it helps someone else - the mirror is 'glued' to the frame using Bostik V60, a neutral cure structural silicone. I taped off the area the backer board would fit into in the rebate so I could then have a clean surface to liquid nails the 6mm ply backer board into. The 6mm cleat and spacer were then liquid nailed to the backer and clamped and weighed down for 48 hours. The wall part of the cleat was screwed into two studs and four 20kg plasterboard anchors.
It's been two weeks and nothing has given way, and the frame has remained square with no sag, so I'm calling this one a win (for now).
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