Price Per Unit: $14.08
Price Per Box: $12.67
DOWSIL 791 Silicone Weatherproofing Sealant is a premium, one-part, neutral-cure RTV silicone sealant designed specifically for weather-sealing applications in commercial construction. Engineered for maximum flexibility, it handles joint movement up to ±50% and delivers long-term adhesion on both porous and non-porous surfaces like glass, aluminium, masonry, and steel. With exceptional weather resistance, including UV, rain, and temperature extremes, this sealant is ideal for use in Australian climates and building codes. Its non-sag, low-string formulation makes application easy and precise.
Q: How should DOWSIL 791 be applied for best results?
A: Clean and dry all joint surfaces thoroughly. Install suitable backing material and apply the sealant in a continuous motion using a caulking gun. Tool within 15 minutes before skin formation to ensure proper bonding and finish.
Q: How does this product perform in extreme weather conditions?
A: DOWSIL 791 performs exceptionally in both hot and cold Australian climates. It offers excellent UV resistance, withstands heavy rain, and maintains elasticity from -50°C to 150°C, making it ideal for external building joints.
Q: Is DOWSIL 791 compatible with porous and non-porous materials?
A: Yes, it adheres well to a wide variety of substrates including aluminium, coated glass, masonry, and galvanised steel without the need for primer in most cases. For porous surfaces, a test placement is recommended.
Q: What are common issues and how can they be avoided?
A: Ensure surfaces are clean, dry, and free from contaminants. Do not apply in confined joints or on wet/frosty surfaces. Use backing rods to control joint depth and avoid three-sided adhesion for optimal movement.
Q: Is it safe to use and dispose of DOWSIL 791?
A: Use personal protective equipment and ensure good ventilation during application. Dispose of containers and unused material according to local regulations. Refer to the SDS for full safety guidance.