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310ml. Low modulus silicone that gives excellent, unprimed adhesion to both porous and non-porous substrates. Suitable for weather sealing and expansion joints. ISO 11600-25LM. Meets ISI specification 9047 Class 50%.

310ml. Low modulus silicone that gives excellent, unprimed adhesion to both porous and non-porous substrates. Suitable for weather sealing and expansion joints. ISO 11600-25LM. Meets ISI specification 9047 Class 50%.
Average Customer Rating:
5 out of 5
5
 out of 
5
(3 Reviews) 3
Open Ratings Snapshot
Rating Snapshot (3 reviews)
5 stars
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3 of 3(100%)reviewers would recommend this product.
Customer Reviews for Dow Corning 791 Weatherproofing Silicone Sealant Black 310ml
Review 1 for Dow Corning 791 Weatherproofing Silicone Sealant Black 310ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
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5 out of 5
Best ever sealant
6 Aug 2011
By chuckles
, Edinburgh
"Dow cornering 791 black is the best so far on the market.
I own a morris minor classic car that had a leaking windscreen rubber and no other sealant would seal it. Now no more puddles inside the car.
"
Review 2 for Dow Corning 791 Weatherproofing Silicone Sealant Black 310ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Dow Corning 791
8 Nov 2009
By scotbuilder
, South West Scotland
"We used this after being impressed when our builders used it. Put in very large pieces of glass. The seal is fantastic, does what it says on the packet exactly. We will use more of this product. Good outside and in the house. allows a little movement in the glass; what we needed here. Waterproof and allows for expansion and contraction on wooden soffits also. An excellent bond. Better value than other DIY products we have tried from big stores. We look forward to using this in other parts of our build to gain a good seal.. watch this space. Do not mistake this for glue though. reccomend it on all counts. also quick delivery."
Review 3 for Dow Corning 791 Weatherproofing Silicone Sealant Black 310ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
3 out of 5
3 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
3 out of 5
3 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Rolls Royce of silicons
9 Jun 2009
By CornishCaper
, Cornwall
"Have used 100s of tubes on conservation project on north Cornwall coast. Excellent adhesion to stone and metal and wholly weather reliable product. Screwfix offering great price as normal but need to offer more colours - dark grey would have helped me."
2 of 3 people found this review helpful.