Dow 791 Silicone WeatherpRoofing Sealant

Surface Preparation

Clean all joints removing all foreign matter and contaminants such as grease, oil, dust, water, frost, surface dirt, old sealants or glazing compounds and protective coatings.

Application

Dow Corning® 791 Silicone Weatherproofing Sealant is a specified, premium performance weathersealing product specifically designed for general glazing and weathersealing in curtain wall and building facades.

Install backing material or joint filler, setting blocks, spacer shims and tapes. Areas adjacent to joints may be masked to ensure neat sealant lines. Primer is generally not required on non-porous surfaces. On porous surfaces, Dow Corning recommends that a test sample be carried out prior to application. To confirm optimum adhesion on either a porous or nonporous surface, adhesion testing should always be carried out prior to the commencement of any project. Please contact your local Dow Corning Sales Application Engineer for specific advice.

Apply Dow Corning 791 Silicone Weatherproofing Sealant in a continuous operation using a positive pressure. Tool the sealant with light pressure to spread the sealant against backing material and the joint surfaces before a skin forms. The applied sealant should be tooled within 15 minutes or before a cured skin forms. Remove masking tape as soon as the bead is tooled.