wedi Joint Sealant is a low V.O.C ( <1%) variety component, Modified Silane MS Polymer that chemically reacts with moisture to deliver strong, flexible and tenacious bonds to variety of surfaces. Especially formulated to connect and seal wedi assemblies in their typically challenging application environment. The product forms water-tight seals on joints, seams and at installations and protrusions creating possible escape opportunities for water or water vapor ( i.e. shower valve cut out in waterproof wedi wall Building Panel in shower installation). Its flexibility allows for dissipation of stress caused by shock, vibration, or thermal movement.