Gunther Premier Plus Gray Mirror Mastic is a very high-quality, urethane-based adhesive formulated to provide a durable, permanent bond between electro-copper-plated glass mirror and acrylic mirror and various porous, non-porous, primed and unprimed building materials. This professional mirror adhesive is a very versatile, safe and dependable product and ideal for high-traffic areas such as gyms, dance studios, and commercial establishments. It holds firm yet absorbs movement, vibrations, and allows for thermal expansion and contraction while keeping its permant bond and flexibility. This adhesive for mirrors can be built out to 2 inches for larger mirrors or uneven wall projects or compressed to 1/16 inches for mirror installations requiring closer tolerances like overlays, mirrored furniture, and medicine cabinets. Support mechanisms are recommended for all mirror applications. This product achieves 30% strength in 24 hours after being applied and fully cures in 7 days.