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 a variety of surfaces. Specially 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 the dissipation of stress caused by shock, vibration, or thermal movement.