Gunther Premier Plus Gray Mirror Mastic is a high-quality urethane-adhesive designed to create a strong and permanent bond between electro-copper-plated glass mirror, acrylic mirror, and various building materials that are porous, non-porous, primed or unprimed. An easy-to-use and versatile product, Premier can be used on acrylic mirrors. Designed for high-traffic areas like gyms, elevators, dance studios and commercial establishments, it has the ability to absorb movement, vibrations, and withstand thermal expansion and contraction while maintaining its permanent bond and flexibility.Benefits and Features of Premier Plus Mirror MasticAchieves 30% strength in 24 hours after being appliedCures fully in 7 daysWaterproof after fully curedFast, permanent bond that keeps its flexibilityQualifies for the LEED Green Building Rating System ApplicationsTileGlass, Painted GlassSteel, other metalsMarbleSeal before Use:ConcretePlasterDrywallSheet RockHard boardChipboardGreen boardPorous substrates should always be sealed. Sealer prevents caustic chemicals from attacking the mirror backing and adds strength to the wall.