The DOWSIL 791 Weatherproofing Silicone Sealant is the perfect solution for all your outdoor sealing and glazing needs. This one part, low modulus sealant is designed to adhere to both porous and non-porous surfaces while providing excellent weatherproofing due to its resistance to ozone, UV radiation, and temperature extremes.

This commercial grade sealant can move with joints up to 50%, meaning fewer filling iterations are needed despite typical movement of building components. Its ISO 11600-F&G-25LM rating and ISO 9047 class 50% ensure quality assurance with each application. Put this high-performing sealant where it counts: from home construction to curtain wall facades, the DOWSIL 791 Weatherproofing Silicone Sealant will provide the protection you need for any project.

  • Excellent weathering characteristics, including resistance to ozone, UV radiation and temperature extremes
  • Joint movement capability +/- 50%
  • Conforms to ISO 11600-F&G-25LM and also meets ISO specification 9047 class 50%
  • Designed for general glazing, and weather sealing in curtain wall & building facades

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

Showing our 1 review for 791 Weatherproofing Silicone Sealant. Write a review
Review Summary - 5 out of 5 based on 1 rating.
October 17, 2023 | Mr Jones
791 Weatherproofing Silicone Sealant

Great product, easy to use. Colour I bought was buff, good match for the pointing in the brickwork

Dow 791 Weatherproofing Silicone Sealant

  • Now 10,74 €
  • (Delivery from 5,57 € )
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Tuesday 13th October? Order within 2 days, 12 hours, 52 minutes