Dow Corning 791 Weatherproofing Silicone Sealant Black 310ml Product Code: 62431

Low modulus silicone that gives excellent, unprimed adhesion to both porous and non-porous substrates. Suitable for weather sealing and expansion joints.


  • Low Odour &


ISO 11600-25LM, ISO specification 9047 Class 50%.
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Additional Information
Technical Specification
  • Brand : Dow Corning
  • Sealant Adhesive Volume : 310 ml
  • Product Type : Weatherproofing Silicone Sealant
  • Model Name : 791
  • Volume : 310 ml
  • Colour : Black
  • Pack Size : 1
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
  • CE Standard (Tested to EN...) : ISO 11600-25LM, ISO specification 9047 Class 50%.
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€7.35 Incl. 23% VAT

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Dow Corning 791 Weatherproofing Silicone Sealant Black 310ml is rated 4.8 out of 5 by 30.
Rated 5 out of 5 by from Excellent - does what it says Excellent - goes on easily - hope it lasts well on the rooflight - I suppose we will only know if it fails when the water comes in !
Date published: 2019-03-28
Rated 5 out of 5 by from Great waterproof filler Very smooth and manageable found it fills gaps up very neatly
Date published: 2018-11-22
Rated 4 out of 5 by from Good Finish Great work ability , but watch out black silicone gets everywhere , wear gloves !!!
Date published: 2018-11-06
Rated 4 out of 5 by from Flexible friend Used this to seal a plastic drain cover from leaves. Even though the cover was screwed tight to the wall they were still getting in. After placing a good bead round the unit and smoothing off with my finger it worked well. I also bought some screw top nozzles as I knew that I would not use all the tube. So hopefully if I need to use it again a year or so down the line the unit will still be usable. Screwfix staff A1 as usual.
Date published: 2018-09-28
Rated 5 out of 5 by from Excellent product Great product, easy to use and smoothed out well giving good finish
Date published: 2018-08-24
Rated 5 out of 5 by from flexible weatherproof sealant I used this over a year ago to fix a leaking gutter and on a roof. Has remained flexible with no problems.
Date published: 2018-07-15
Rated 4 out of 5 by from Perfect match Laying black drainage channels before the winter rains and sections needed to be joined using a silicone sealant. This black silicone sealant is a perfect match on colour and seals well. Slightly more runny than some sealants but this helps it to flow into the joints to make a better seal.
Date published: 2018-07-05
Rated 5 out of 5 by from Black and sticky... I needed to seal a cable entry hole into a black sided portacabin. This did the job perfectly. The silicone is sticky and doesn’t move easily, unlike normal silicone sealants. Cleaning up is easy enough, and for me one tube of this will last ages (or until it naturally cures!)
Date published: 2018-06-27
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