Dow Corning Contractors Silicone Seal Strip is a preformed silicone elastomer extrusion seal that is used for general building applications. Contractors silicone seal strip is very easy to install. We recommend using this product with Dow Corning 791 silicone weatherproofing sealant. Dow Corning Contractors Silicone Seal Strip is clear for ease of quality control and assurance of good sealant application. Mechanical fastening is not required. Dow Corning Contractors Silicone Seal Strip is not intended for use with Dow Corning 790 Silicone Building Sealant as an adhesive or with non-Dow Corning sealants or acetoxy cure silicone sealants as the bonding sealant or in a below-grade application.