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Dow Corning 791 Weatherproofing Silicone Sealant White 310ml (33876)

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

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£6.29INC VAT (£20.29/Ltr)

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Dow Corning 791 Weatherproofing Silicone Sealant White 310ml is rated 4.8 out of 5 by 12.
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Rated 5 out of 5 by from Just the stuff!! I've used this sealant and found it to be good, so far. Not applied that long ago so cannot report on 'reliability'. Not the cheapest but, in reading Dow Corning literature online, I find it to be superior in several respects to the less costly sealants. Good bonding and easy application means I shall buy again. Recommended.
Date published: 2017-08-20
Rated 5 out of 5 by from Worth the money Very good silicone - highly recommended by others to me. Used to replace aged silicone around UPVC windows. Do check the use by date as the first one I picked was about to expire. Screwfix happily exchanged for one dated next year.
Date published: 2017-08-11
Rated 5 out of 5 by from Excellent sealant Used both the black and the white versions on everything from sealing in the sunroof frames on my Land Rover to sealing baths and windows. Sticks to pretty much everything. Highly flexible. Highly recommended.
Date published: 2017-08-10
Rated 4 out of 5 by from Around the Door/Window I went with the 791 Dow Corning option - primarily for its expansion/flexibility qualities. Need to go around the window frame and doorway. This is always needed when the weather changes.
Date published: 2017-01-30
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Can this be used on guttering to seal leaks at joints?

Asked by: King55
Gutters can be a tricky application to get a completely water tight seal. Gutters are long lengths of material which generally have very high thermal movements, whereas silicone in guttering applications are often applied in very thin applications, limiting its ability to accommodate movement. Furthermore, unless the gutter is kept clear and straight, the seal in some sections may be exposed to permanent water immersion which can cause a loss of adhesion over time. The key to forming a good long term seal on your gutter is to use mechanical fixings at the union/connector along with the silicone to form a gasket, this way you are not relying on the chemical adhesion of the product which could become compromised by excessive thermal movement and long term water immersion. For this kind of application Dow Corning 791 would be a good choice it will generally stick very well to uPVC and metal, have good movement accommodation and unlike many cheaper sealants, will not shrink over time.
Answered by: DowCorning ProductSupport
Date published: 2017-08-26

Is this item suitable to fit double glaze units?

Asked by: RicD
Yes, Dow Corning 791 can be use to bed in double glazed units as well as sealing the glass and the frame.
Answered by: DowCorning ProductSupport
Date published: 2017-07-23

Could you advise what the curing time is for this silicone?

Asked by: reppppppppppppp
Higher temperatures and higher humidity (within reason) increase the cure rate of most commonly available silicones including Dow Corning 791. In normal conditions, Dow Corning should be tack free within the hour and cure at a rate of approximately 2/3 mm per 24 hours.
Answered by: DowCorning ProductSupport
Date published: 2017-09-04
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Specification
Brand Dow Corning
Colour White
Manufacturer Guarantee 1 Year Guarantee
Model Name 791
Pack Size 1
Pieces in Pack/Case 1
Product Type Weatherproofing Silicone Sealant
Sealant Adhesive Volume 310 ml
Volume 310 ml

ISO 11600-25LM, ISO specification 9047 Class 50%.

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Safety Data Sheet (COSHH)