A sizeable wall mirror can't be fixed with adhesive alone, however strong it seems on the label: the safety of the installation depends on combining different fixing systems properly according to the real weight of the piece.
Special mirror adhesive
There are specific adhesives formulated not to attack the silvered back of the mirror (generic adhesives can damage the reflective layer over time). They are suitable as the main fixing system for small and medium mirrors on a wall in good condition.
Mechanical anchoring: mandatory on large pieces
For large or heavy mirrors, the adhesive must be supplemented (or replaced) with mechanical supports: perimeter clips, a lower support profile that bears the weight, or a specific mirror rail system. Adhesive alone is not designed to indefinitely hold the full weight of a large piece against gravity.
Why check the wall's condition first
Whichever system is chosen, the wall must be in good condition (no damp, no flaking paint) to guarantee grip. Installing on a deteriorated surface, even if the fixing system is correct, compromises the safety of the whole installation over time.
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