The Glue to wall Mirror must be installed onto a level surface otherwise the double sided tape will not hold until the Adhesive sets. Make sure the adhesive selected is compatible with mirrors as some will damage the mirror coating. The use of timber supports cut to the height required off vanity is also recommended for ease of installation, this will keep mirror at the desired height. As double sided tape makes contact with wall it will adhere solidly making it almost impossible for a second chance. Selection of correct adhesive and support whilst drying is the responsibility of the installer and is not covered under the warranty. Ablaze mirrors recommend running adhesive in vertical beads so that condensation behind the mirror can drain away.