Dow 791 Weatherproofing Silicone Sealant Clear 310ml is a one-part sealant designed for application on exterior walls. It provides a tough, flexible bond across a variety of construction materials, including porous and non-porous surfaces. Ideal for outdoor façades, glazing and expansion joints, this sealant delivers excellent durability against UV rays, ozone, and extreme weather conditions.

Key Features

• Delivers a weatherproof seal on glass, metal, masonry and timber
• Offers strong adhesion to a wide range of construction materials
• Maintains flexibility and strength even in high-movement joints
• Ideal for use on expansion, perimeter and connection joints
• Provides resistance to UV, ozone and temperature shifts

Technical Information

• Application temperature: 5-40°C
• Extrusion rate: 220g per minute
• Curing time for 4mm: 3 days
• Curing time for 2mm: 1 day
• Skin over time: 20 minutes
• Tack free time: 30 minutes
• Specific gravity: 1.50
• Cure system: Alkoxy
• Volume: 310ml
• Colour: Clear

Application Instructions

1. Ensure that the surfaces are clean and dry
2. Areas not being sealed must be covered with masking tape for protection
3. The joint should be tooled within 5 minutes of application
4. If sealant is misapplied to porous substrates, it should be left until it is just cured and then removed by peeling, cutting or other mechanical means

Product Disclaimer

• Not suitable for use on bituminous substrates, substrates based on natural rubber or on building materials and flexible plastics which might bleed oils, plasticisers or solvents
• Please note that bleeding can occur on porous substrates such as concrete, marble, granite or other natural stones
• Not recommended for use on submerged joints or in joints where abrasion is likely to occur
• This product is neither tested nor represented as suitable for medical or pharmaceutical use
• Not recommended for structural glazing or insulated glazing applications
• This product is not suitable for areas where food contact is likely