Dowsil 791 Weatherproofing Sealant Black 310ml - Dow Corning Black

Name: Dowsil 791 Weatherproofing Sealant Black 310ml - Dow Corning Black
Brand: Dow Corning
SKU: vk7w42hgde
Availability: InStock

DOWSIL™ 791 Weatherproofing Silicone Sealant is a one-part, low modulus, neutral curing silicone s...

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Colour

Black Brown White

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Product Information

Full details

This guide is for anyone using Dowsil 791 Weatherproofing Silicone Sealant, a versatile sealant designed for both commercial and domestic applications. The key benefit is its excellent weatherproofing capabilities, providing a durable and reliable seal against the elements. However, it's important to note that the sealant's performance is dependent on proper surface preparation and application. This guide will cover everything you need to know about using Dowsil 791 effectively.

All features

Colour	Black
Model Part Number	4024907/C05
Brand	Dow Corning

Extended Product Information

FAQs

What is the working time for Dowsil 791?

The working time is approximately 20 to 30 minutes.

How long does it take for Dowsil 791 to become tack-free?

It becomes tack-free in approximately 2 hours.

What is the application temperature range?

The application temperature range is -20 to +50°C.

What surfaces does Dowsil 791 adhere to?

It provides unprimed adhesion to most porous and non-porous surfaces.

Is Dowsil 791 suitable for exterior use?

Yes, it is resistant to UV radiation and suitable for exterior applications.

What is the joint movement capability?

The joint movement capability is +/-50%.

How should I store the sealant?

Store in a cool, dry place.

What are the common uses of Dowsil 791?

It is suitable for weather sealing of curtain walling, building facades, and expansion joints. It can also be used as a frame sealant.

Troubleshooting

Sealant isn't adhering properly.

Ensure surfaces are clean and free of contaminants. Use a primer if recommended for the specific materials.

Sealant is bubbling after application.

Ensure the application is done in the correct temperature and humidity range. Avoid applying to wet surfaces.

Sealant is taking too long to cure.

Check the temperature and humidity. Lower temperatures and higher humidity can extend curing times. Ensure proper ventilation.

Pros and Cons

Pros

Excellent weather resistance, protecting against UV, ozone, and extreme temperatures.
Provides a strong, lasting seal with a joint movement capability of +/-50%.
Fast curing time reduces project completion time.
Adheres well to many surfaces without the need for a primer.
Neutral cure formula minimizes corrosion.
Suitable for a wide range of applications.

Cons

Requires proper surface preparation for optimal adhesion.
Working time is limited to 20-30 minutes, requiring efficient application.
Application temperature range is limited to -20 to +50°C.

Setup, Compatibility & Care

Surface Preparation: Ensure surfaces are clean, dry, and free of any contaminants such as dust, grease, and old sealant. Clean with a suitable solvent if necessary.
Application: Apply the sealant using a caulking gun. Ensure full contact with the surfaces.
Tooling: Tool the sealant within the working time (20-30 minutes) to achieve a smooth finish and ensure proper contact.
Curing: The sealant will be tack-free in 2 hours and fully cured within a few days, depending on environmental conditions.
Compatibility: Dowsil 791 is compatible with most common building materials. Always test for compatibility if you're unsure.
Storage: Store in a cool, dry place. Unused sealant can be stored for future use if the tube is properly sealed.