Browse store

Dow Corning 791 Weatherproofing Silicone Sealant Black 310ml (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 &

More Info

£4.99INC VAT (£16.10/Ltr)
Was £6.29 Save £1.30 (20%)

Add to basket for...

Dow Corning 791 Weatherproofing Silicone Sealant Black 310ml is rated 4.9 out of 5 by 15.
  • y_2017, m_5, d_22, h_22
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_15
  • loc_en_GB, sid_62431, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix

Add to saved list...

Save
Rated 5 out of 5 by from Dow Corning 791 Extremely good compound easy to use and works really well
Date published: 2017-04-10
Rated 5 out of 5 by from Sealer superb Advised by excellent helpful screwfix staff to use Dow corning low modulus sealer for my barn conversion turned out very good advice finish is superb and product was a good price excellent advice from an excellent company
Date published: 2016-11-14
Rated 5 out of 5 by from DOES THE JOB I used this on my old pre fab concrete garage to reduce the draughts where the panels met it came out of the tube really easy but did not slump so I could do a seven foot by half inch run in one go easily and the silicone adhered well to concrete and when I checked it the next day it was set nicely but still soft to touch so had the flexibility that I needed in the garage and as a bonus it was on offer
Date published: 2016-11-12
Rated 5 out of 5 by from very good weatherproof silicon This is definitely a weatherproof silicone you can trust. It is easy to apply and it works really well. I totally recommend, especially for a similar price.
Date published: 2016-10-24
  • y_2017, m_5, d_22, h_22
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_15
  • loc_en_GB, sid_62431, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix

Does this sealant cure to a matt or shiny finish ?

Asked by: MickyS
It is difficult to quantify the shininess of the finish. Whilst all silicones have a degree of glossiness to them, DC 791 is less shiny than most, particularly compared to most sanitary silicones.
Answered by: DowCorning ProductSupport
Date published: 2017-05-19

how many linear metres will a tube cover

Assuming an average bead diameter
Asked by: Anonymous
Joint size can vary hugely between different applications, for example, a triangular (fillet) joint may use half as much silicone as a square or rectangular (butt) joint. However to give you an indication, one 310ml cartridge, at a 6x6mm square joint size, assuming 10% wastage, will cover 7.8 linear meters, whereas a 10x10mm square joint will cover 2.8 linear meters.
Answered by: DowCorning ProductSupport
Date published: 2017-05-19

I need to seal around a window in current rainy weather. Can this be applied in wet conditions or will it affect its performance.

Asked by: Duckinandiving
Silicones are hydrophobic and need to be applied in dry conditions, otherwise they will have difficulty sticking to the substrate.
Answered by: DowCorning ProductSupport
Date published: 2017-05-19
  • y_2017, m_5, d_23, h_10CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_3
  • loc_en_GB, sid_62431, prod, sort_[SortEntry(order=LOCALE, direction=DESCENDING), SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix
Specification
Brand Dow Corning
Colour Black
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

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

Downloads

Safety Data Sheet (COSHH)