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Dow Corning 791 Silicone Weatherproofing Sealant is a one-part, medium-modulus, elastomeric sealant designed for general weathersealing. It is a silicone formulation that cures to a flexible and curable silicone rubber building joint seal. FEATURES & BENEFITS Ideal for expansion, connection, perimeter and other movement joints Neutral cure – suitable for use on coated glass, galvanized steel, masonry and other porous and nonporous substrates Extension/compression movement capability of up to ±50 percent of the original joint width Excellent weatherability, virtually unaffected by sunlight, rain, snow, ozone Excellent unprimed adhesion to a wide variety of construction materials and building components Ease of application – ready to use as supplied. Excellent rheology, low string upon gunning. COMPOSITION - One-part, neutral-cure, RTV silicone sealant.