NuFlex® 319 Glazing Silicone Sealant is a one-part, high modulus, non–corrosive moisture curing 100% silicone sealant. NuFlex® 319 has superior adhesion to most construction materials without the need for a primer. NuFlex® 319 cures to form a flexible, watertight bond to glass, plastic, metal, concrete and masonry, factory and field installed metal building systems.