Heavy mirror support bonding

[Osheamus]

I have a heavy mirror which had an aluminium bar bonded on rear to support it on wall, but it’s come unstuck, what can l use to bond it back, the mirror has no other frame, just plain glass.

 

[Silentrunning]

I have used these in the past with complete success.

OOK 1/4 in. 20 lb. Plastic Mirror Holder (4-Piece) 50225 - The Home Depot

OOK mirror clips are designed to blend in with mirror or add unique flair. Mirror clips come with wall anchors and screws. For best results, install clips 1/4 in. from each corner of mirror.

www.homedepot.com

 

[CalamityJane]

Admittedly i have no experience with this kind of project but I get the idea that you are looking to keep the floating mirror look. This is what I found and there are probably other similar projects.

Nano470 Construction Glass Glue (20 G)|high Strength Adhesive Will Simply Amaze You|The Bonding of Glass to Glass and Glass to Metal Extremely Strong https://www.amazon.com/dp/B00HM81BG0/ref=cm_sw_r_cp_api_i_y88.Cb2C060HT