Plumbers Caulk™ is a high quality commercial grade product. Easy-to-use, single component, non-sag, siliconized acrylic-latex caulk. Excellent expansion-contraction and mildew resistance properties. Plumbers Caulk™ makes a flexible, durable and UV resistant waterproof seal on interior and exterior surfaces. Will not crumble, resists shrinking and can be painted. Cleans up easily with soap and water before it cures, flows easily from tube and cartridge, bonds to all common building materials, tools easily, is tack free in 1 hr and has a 25 year life expectancy.