A two-part silicone sealant designed for use as a secondary sealant in a dual-sealed insulating glass unit, as well as in an insulating glass unit that will be structurally glazed. The product cures to a durable, high-modulus, flexible silicone seal that is chemically stable and creates a weathertight bond. It has excellent unprimed adhesion to glass and metal substrates, such as galvanized steel and aluminum. The base component, DOWSIL 982 Silicone Insulating Glass Sealant-Base, is a smooth, white paste. The curing agent component, DOWSIL™ 2-Part Curing Agent, is a pourable liquid available in black or gray.