Dowsil Silicone Sealant - White

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DOWSIL 798 Cold and Clean Room Sealant is specifically designed for sealing in refrigeration units...

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Product Information

Full details

This guide is for anyone using Dowsil 798 Cold and Clean Room Sealant, specifically in environments prone to moisture and microbial growth. The key benefit is its ability to create a durable, mildew-resistant seal. Keep in mind that proper surface preparation is crucial for optimal adhesion. This sealant is ideal for sealing refrigeration units, coldrooms, and similar areas, offering a long-lasting, flexible, and protective barrier against the elements.

All features

Colour	White
Model Part Number	3307271/C05
Brand	Dowsil

Extended Product Information

FAQs

What is the shelf life of Dowsil 798?

The shelf life is 1 year from the date of manufacture. Check the expiration date on the cartridge.

Can I paint over Dowsil 798?

Dowsil 798 is a sealant, not a paint. It is not designed to be painted over. Consider a sealant appropriate for painting if the seal needs to be painted.

How do I remove excess sealant?

Use DOWSIL R-40 Universal Cleaner to remove excess sealant immediately after application. For cured sealant, mechanical removal may be necessary.

What is the cure time for Dowsil 798?

The cure time is approximately 24 hours under normal conditions.

Can Dowsil 798 be used outdoors?

Yes, Dowsil 798 is resistant to UV radiation and temperature extremes, making it suitable for outdoor applications.

What colors does Dowsil 798 come in?

Dowsil 798 is available in white.

What kind of sealant gun should I use?

A standard sealant gun suitable for 310 ml cartridges is recommended.

Is Dowsil 798 safe for use around food?

While the sealant itself is likely safe once cured, it's best practice to avoid direct contact with food.

Troubleshooting

Sealant is not adhering properly.

Ensure surfaces are thoroughly cleaned and degreased before application. If necessary, roughen the surface to improve adhesion. Check that the product is within its shelf life.

Sealant is still tacky after 24 hours.

Check the temperature and humidity. Extremely low temperatures or high humidity can slow curing. Ensure the sealant was applied correctly and that the joint wasn't too deep.

Odor is strong after application.

Ensure adequate ventilation during and after application, despite the neutral cure. The odor should dissipate as the sealant cures.

Pros and Cons

Pros

Excellent resistance to mildew and bacteria, suitable for damp environments.
Neutral cure system minimizes odor during application.
Highly flexible, accommodating movement and temperature changes.
Durable and resistant to UV, ozone, and temperature extremes.
Easy to apply due to the one-part formula.

Cons

Requires proper surface preparation for optimal adhesion.
Shelf life of 1 year, requiring timely use after purchase.
May require a sealant gun for application, depending on the cartridge type.
Cure time of 24 hours means the sealed area is out of use for a day.
Limited color availability (white only).

Setup, Compatibility & Care

Surface Preparation: Ensure the surfaces are clean, dry, sound, and free from frost, release agents, old sealants, and other contaminants. For non-porous surfaces, clean and degrease with a suitable solvent. For porous surfaces, mechanically clean using a steel brush or sanding disc.
Application: Apply the sealant using a sealant gun. Tool the joint within 5 minutes of application to ensure proper adhesion. Ensure the sealant fills the gap completely.
Curing: Allow the sealant to cure for approximately 24 hours for complete sealing.
Compatibility: Dowsil 798 is compatible with a wide range of substrates, including: Masonry, Tiles, Aluminium, PVCu, Polyacrylate, Polycarbonate, Glass, Ceramic Tile, Anodised Aluminium, Mill Finished Aluminium, Powdercoat, Stainless Steel, Copper, and Brass. Test compatibility on a small, inconspicuous area before large-scale application.
Care: Excess sealant can be cleaned using DOWSIL R-40 Universal Cleaner. Store the sealant in a cool, dry place. Once opened, use the entire cartridge within the recommended shelf life.