Attaching mirror glass to backer board

[Rick Herrick]

I am making a mirror to match my daughters dresser.  The glass is 36 x 30 and the frame is white oak (3/4" x 2.75").  I have a backer board of MDF that is 1/4" thick.  I have a rabbit in the back and everything dry fits just fine.  The mirror is beveled but the meat of it is still just a bit over 1/8" thick.  It is a little whippy but I wanted as little weight as possible.  My question is should I adhere the mirror to the MDF backer (and what with ?).  I kind of want to so the entire sandwich is a little stiffer but wanted to get opinions.

 

[usernumber1]

I'm assuming this is going on a wall

I would put paper backing and either mirror adhesive or construction glue in the corners. 1/8 mirror is pretty thin.
I've also used ram board tape paper tape all around as well.

 

[afish]

https://www.homedepot.com/p/Loctite...Marble-and-Granite-Adhesive-1693636/203438035

 

[Rick Herrick]

I'm assuming this is going on a wall

I would put paper backing and either mirror adhesive or construction glue in the corners. 1/8 mirror is pretty thin.
I've also used ram board tape paper tape all around as well.

Yes, it is for the wall.  Not sure how the paper backing helps though.  Are you saying to glue the mirror/backer to the actual frame in the corner?  I will use the plastic picture frame turn bottoms attach to the frame to hold the mirror in.

https://www.homedepot.com/p/Loctite...Marble-and-Granite-Adhesive-1693636/203438035

Would you just squiggle this all over or do you kind of spread it around so its evenly distributed ?

 

[afish]

I usually do dots size would depend on flatness of substrate. If its uneven fewer and larger blobs. Smoother flatter small blobs and more frequent. Some adhesives will cause the silver on the back to fail prematurely so best to use a mirror safe glue. I have never tried to trowel it on just the blob and stick method.  depending on the size I have just tapped the mirror to the wall wile it dried.  It sticks good so the tape is mostly there to keep it from sliding down the wall.
 

 

[usernumber1]

paper backing after it's glued like this. it's just another layer of protection and makes it look nice. glue does most of the work. if you want to use the clips instead i'd use cardboard and tape the sides unless you have some thin mdf that would fill your rabbit flush

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