Dowsil 791 600ml

Units per pack

A premium quality, low modulus one-part silicone sealant giving excellent adhesion to both porous and non-porous construction substrates, in most cases, without the need for a primer.





Unit Price

£7.89   + VAT


Our price

£7.89 - £8.95 £9.47 - £10.74 inc VAT


£11.43 £13.72 inc VAT

HUGE SAVINGS ON BULK ORDERS Call 0845 177 0666 for a bespoke quote

Dowsil 791

Dowsil 791 is a premium-quality silicone sealant, ideal for both porous and non-porous construction substrates. As one of the most economical options for quality silicone weathering, Dowsil 791 quickly cures to a durable, flexible seal, able to accommodate for significant joint movement.

Features and Benefits

  • Ready to use as supplied
  • Unaffected by sunlight, ozone, weather
  • Joint movement capability
  • Low odour
  • Fast cure

Directions of use

Before use, remove any old sealant or contaminants from the area being sealed. We would also recommend masking any areas adjacent to the joints to ensure neat sealant lines.

For best results, apply Dowsil 791 in a continuous motion using a light pressure. Once applied, spread the sealant using a backing material to create a smooth joint surface. This should be completed within 15 minutes or before cured skin has formed.


View our full Dow Product Range

View our comprehensive range of Sealants and Adhesives

Product Data Sheet

Dow Corning Q&As

How long does silicone sealant take to dry?

Silicone sealant usually takes at least 24 hours to completely dry. This means, if you’re using silicone sealant in your shower or bath, you must wait at least 24 hours before using the appliance, to ensure you don’t disrupt the curing process.

How to clean silicone sealant?

If your silicone sealant is starting to look mouldy, your best solution is to remove and replace the sealant to completely eradicate the mould. Once your new sealant is applied, we’d recommend regularly cleaning your sealant with an anti-mould cleaner to keep it in prime condition.

Is silicone sealant waterproof?

The majority of silicone sealants are waterproof and will provide a watertight seal to joints. Dow Corning 791 is a fantastic silicone sealant solution, as it’s not only waterproof, but also resistant to mould and mildew.





Packs per Box


Solseal Delivery Terms

PLEASE NOTE: Due to the ongoing COVID situation please allow 4 to 5 working days for delivery unless “Next Day Express Delivery!” is stated beside the Product Name on your Sales Confirmation, in which case your goods will be delivered on the next working day** for orders received by 11am. Please be assured we will dispatch your order as quickly as possible*.

(*subject to stock availability – **please note our warehouses are not open at weekends or on public Bank Holidays)

The following Sika Everbuild items will be delivered next working day when ordered by 11am*

Contractors Silicone 200 white, clear C3
125 One Hour Caulk 310
450 Builders Silicone Translucent 310
825 LM all colours 380
996 LM Trans, Black, Clear 380
HM 60 Sanitary White, Translucent 310
S50 MM White, Translucent 310
S50 MM Jasmine, Manhattan Grey 310
Silicone 500 Ivory, Sandstone, Prem White C3
Fire Sealant 300 Grey, White 380
Fire Sealant 400 Grey, White 380
Antipick 109 Grey, Soft Linen, White 310
Stayseal NP75 1.2L
NP 2 Primer 1L
P1 Primer 1L
Sika Primer 3N 1L
Hybriflex 25LM White 380
Hybriflex 480 Grey, White 380
Hybriflex FL Grey 600
Puraflex 40 Grey, White, Black 600
Puraflex 25 Grey, White 300
225 Industrial Silicone, Brushed Steel, Black 600
Cleanroom Silicone 565 310
335 Construction Silicone, Bronze, Toffee, Grey, Brown 300
  Mapesil AC HM Colours 310
Stixall Black, White, Grey 300
Stixall Clear 300


Round Backer Rod 12mm 900
Round Backer Rod 15mm 500
Round Backer Rod 20mm 300
Round Backer Rod 25mm 200
Flat Backer Foam 30x10mm (1/2Roll Size) + 20x10mm roll 160
Flat Backer Foam 30x10mm (Full Roll Size) 320
Wonder Wipes Trade each
Solseal Hook Knives 76mm each
Solseal Blades (100/pack) each
Solseal Scrapers each
Solseal Extn Nozzles for 310mm each
600ml Cox Bulk Gun each
Solseal HD Skeleton Gun (Geocel-Cox) each
Solseal Wire Brush 200mm each
Sika Sanisil HM White, Clear 300ml
  Sikaflex Pro 3 Grey, Black 600ml
  Sikaflex Pro 3 Self Levelling Grey, Black 600ml
  Sikasil Pool Grey, White C3
  Sikabond TF Plus N – EPDM Membran Adhesive 600ml
  Sika EPDM Membran 100mm x 25m each
  Sika EPDM Membran 150mm x 25m each
  Sika EPDM Membran 200mm x 25m each
  Sika EPDM Membran 250mm x 25m each
  Sika EPDM Membran 300mm x 25m each
  Palu Tooling Block each
 Tooling Sticks (pack of 4) each
 Sika Plastix 22a Silicone LM Anthracite 300ml
 Solseal EPDM Roller 100ml each
 Solseal EPDM Roller 150ml each
 Solseal EPDM Scissors each
 Titan Dolphin Knife each
 Primer Brush each
 Dusting Brush each



All orders are next working day service on orders received by 11.30am, and 48-hour delivery on orders received after 11.30am.
Cost: £9.95 + vat (or £6.95


All orders are next working day service on orders received by 10.30am, and 48-hour delivery on orders received after 10.30am
Cost: £19.95 + vat


Standard orders (less than 6 units) – orders received by 11:30am will be delivered within 2 working days, orders received after 11:30am will be delivered within 3 working days*
Cost: £19.95 + vat

Large orders (of 6 units or more) – orders received by 11:30am will be delivered the following day, orders received after 11:30am will be delivered within 2 working days*
Cost: £19.95 + vat


Please call us on 0845 177 0666 for all orders and delivery details, as the lead-in times and availability of products vary.