Dowsil 798+ Cold and Clean Room Silicone Sealant 310ml Cartridge - White

DOWSIL™ 798 Cold and Clean Room Sealant is a specialised, high-performance silicone sealant designed for sealing joints in refrigeration units, cold rooms, and other areas prone to mildew and bacterial growth. With its one-part, neutral curing formulation, it provides a durable, flexible seal that resists mildew, bacteria, and other contaminants. Suitable for both interior and exterior use, DOWSIL™ 798 offers excellent adhesion to a wide range of substrates, including masonry, tiles, aluminium, PVCu, glass, and stainless steel. Its low modulus and high elasticity make it ideal for environments exposed to temperature extremes, UV radiation, and ozone.

• Bacteria and mildew resistant
• Superior performance under extreme conditions.
• Adheres to a wide range of materials

Before applying sealant, make sure all surfaces to be sealed are clean, dry, and in good condition. Surfaces should be free from frost, release agents, old sealants, and any other contaminants that could affect adhesion.

• For non-porous surfaces, wipe them with a clean, oil- and lint-free cloth dampened with a suitable solvent such as DOWSIL™ R-40 Universal Cleaner to remove dirt, grease, and other contaminants.
• For porous surfaces like concrete, brickwork, and mortar, mechanically clean the surfaces using a steel brush, sanding disc, or another suitable mechanical method to remove debris and contaminants.
• To avoid contamination of the surrounding areas and ensure a neat sealant line, mask areas adjacent to the joints with tape. This will help prevent the sealant from touching unwanted surfaces.

Always ensure adequate ventilation when using solvents. Keep away from heat, sparks, and open flames. Wear solvent-resistant gloves and follow all safety precautions listed on the solvent container label.

The sealant is ready for immediate use. Cut the tip off the cartridge and screw on the nozzle and cut the nozzle to the desired bead size. We recommend using the Geocel Cox Skeleton Gun for application.

• To avoid contamination of the surrounding areas and ensure a neat sealant line, mask areas adjacent to the joints with tape. This will help prevent the sealant from touching unwanted surfaces.
• When back-up material is necessary, use a closed-cell polyethylene backer rod. This helps prevent three-sided adhesion, ensuring proper sealant movement.
• For joints that are too shallow to accommodate a backer rod, use low tack polyethylene tape as a back-up material to provide back pressure.
• Apply the sealant to the prepared joint, ensuring it fills the joint completely. Be mindful of joint dimensions and depth to accommodate the sealant’s movement capabilities.
• Tool the sealant within 5 minutes of application to ensure good contact between the sealant and the substrate we recommend Bedec Silicone Profilers. Tooling also helps create a smooth, professional finish for the joint.

Always follow the instrutions found on the cartridge.

Q. What is DOWSIL™ 798 Cold & Cleanroom Silicone Sealant used for?

A. DOWSIL™ 798 Cold & Cleanroom Silicone Sealant is specifically formulated for sealing areas in refrigeration units, cold rooms, and other environments where temperature control and hygiene are important. It is ideal for both interior and exterior applications where joints are prone to mildew.

Q. Can DOWSIL™ 798 Silicone Sealant be used outdoors?

A. Yes, DOWSIL™ 798 Silicone Sealant is suitable for both interior and exterior applications. It offers reliable sealing in environments where temperature fluctuations and moisture could cause other sealants to fail.

Q. Is DOWSIL™ 798 Silicone Sealant mildew-resistant?

A. Yes, DOWSIL™ 798 is specially formulated to resist mildew, making it an excellent choice for areas where moisture is present, such as cold rooms, refrigeration units, and cleanrooms.

Delivery - All orders placed on a working day before 3pm will be dispatched on the same day for next working day delivery. Orders placed before 3pm on Friday will be delivered on Monday (excluding bank holidays). Orders placed on weekends and Bank Holidays will be dispatched on the next working day. 

Delivery of Tinted Products - Tinted paints are dispatched in line with our express order process, shown below. However, due to their bespoke nature, please allow up to an additional 5 working days to accommodate any potential courier delays or delivery issues before receiving a refund or replacement.

We strongly suggest customers avoid booking tradespeople until they receive their order. Next Day Paint will not be held liable for any costs incurred due to order processing errors, delivery delays, or other issues that may result in financial loss.

Delivery Options

Express Shipping - £3.99

Order by: 3pm, Monday - Sunday

Expected delivery: Next working day, 8am - 9pm

Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following day

AM Delivery - £12.99

Order by: 2pm, Monday - Sunday

Expected delivery: Next working day by 2pm

Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following AM

Late Cut-Off - £5.99

Order by: 4pm, Monday - Friday 

Expected delivery: Next working day, 8am - 9pm

Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following day

Saturday Delivery - £9.95

Order by: 2pm, Friday 

Expected delivery: Saturday, 8am - 9pm

Standard Delivery (Out of Zone Postcodes Only) - £6.99

Order by: 3pm, Monday - Sunday 

Expected delivery:  3-5  working days, 8am - 9pm

Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following day

We do not deliver to the Channel Islands or the Republic of Ireland

Certain postcodes delivery times and charges may vary please head to the cart to see your available delivery options.

Returns

We offer a 14 day money back guarantee for all goods shipped correctly that are not required. If the item is not required, please send the item back for a full refund in its original condition, unused with its original packaging. Please note return for unwanted item is at your own expense.

Contact us as soon as possible to inform us you will be returning the product either by a contact form or by calling our team on 0161 960 0217.

All tinted paint purchases are final and non-refundable. If you're unsure about your selection, please refer to the product listing or contact us for guidance before ordering. Once mixed, tinted paints cannot be returned or refunded, regardless of delivery delays or changes in circumstances.

While we aim to meet delivery timelines, we are not responsible for delays caused by couriers, weather, or other external factors.

We recommend ordering samples or colour charts before purchasing. While we strive to represent colours accurately, screen settings and surface types can affect appearance. Opened tins cannot be returned due to dissatisfaction with colour.

For non-tinted products, we offer a 14-day money-back guarantee. Items must be returned unused, in original condition and packaging, at your own expense.

Damaged Paint

Please visit our damages page, where we can help resolve the issue for you. 

Incorrect Item

If we have sent you a different item from what you ordered, we will be happy to organise an exchange for the correct goods at no extra charge to yourself, please get in touch to organise this.

Faulty Items

Faulty items can be refunded or exchanged within 30 days. All returns are tested, and if no fault is found, no refund will be issued you'll have the option to have the item returned. For faults discovered after 30 days, please contact the manufacturer for further support.