--- product_id: 51559277 title: "Dowsil 791 Sealant Black 310ml" brand: "dowsil" price: "£11.00" currency: GBP in_stock: true reviews_count: 9 category: "Dowsil" url: https://www.desertcart.co.uk/products/51559277-dowsil-791-sealant-black-310ml store_origin: GB region: United Kingdom --- # 20-30 min working time Fast cure - tack free in 2 hrs Superior weather resistance Dowsil 791 Sealant Black 310ml **Brand:** dowsil **Price:** £11.00 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal the deal with speed and strength — don’t let leaks hold you back! ## Quick Answers - **What is this?** Dowsil 791 Sealant Black 310ml by dowsil - **How much does it cost?** £11.00 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/51559277-dowsil-791-sealant-black-310ml) ## Best For - dowsil enthusiasts ## Why This Product - Trusted dowsil brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Certified Quality:** Meets ISO 11600-25lm and ISO 9047 Class 50 standards for trusted professional-grade results. - • **Rapid Performance:** Fast curing—tack free in just 2 hours to keep your projects moving swiftly. - • **Unmatched Durability:** Withstands extreme temperatures, UV radiation, and harsh weather for long-lasting protection. - • **Effortless Application:** Ready-to-use one-part formula for seamless weathersealing without the hassle. - • **Precision Working Window:** Generous 20-30 minutes working time lets you perfect every seal with ease. ## Overview Dowsil 791 Sealant Black is a premium one-part silicone sealant designed for professional weatherproofing. It offers excellent flexibility, rapid curing, and superior resistance to UV, temperature extremes, and moisture. Ideal for building joints and outdoor applications, it delivers a durable, black finish that blends seamlessly while meeting rigorous ISO standards. ## Description From the manufacturer Dowsil 791 Sealant Black A one-part, medium-modulus, elastomeric sealant designed for general weathersealing. It is a silicone formulation that cures to a flexible and curable silicone rubber building joint seal. Benefits Ease of application – ready to use as supplied Excellent rheology, low string upon gunning Excellent weatherability, virtually unaffected by sunlight, rain, snow, ozone Neutral cure Low odor Review: Would recommend - Strong bond very strong not watery like other reviews said perfect for letting me watertight seal boats and bait boats flex able but no tare Review: Quality sealant - A1 - I bought this for a seal i needed around a black wooden outdoor unit, where I had some gaps from a pipe I had going through it. It sealed easily and was black to match the unit etc. Went off fairly fast and has remained ever since doing its job - Sealing. Cheap, easy to use and very effective. A1 Product ## Features - Excellent weathering characteristics - Resistance to radiation and temperature extremes - 20-30 minutes working time - Fast cure - tack free in 2 hours - Confirms to ISO 11600-25lm and meets ISO specification 9047 Class 50 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0063PXFE4 | | Best Sellers Rank | 26,371 in DIY & Tools ( See Top 100 in DIY & Tools ) 446 in Sealers | | Brand | Dowsil | | Colour | Black | | Compatible Material | Rubber | | Country Of Origin | United Kingdom | | Customer Reviews | 4.3 out of 5 stars 350 Reviews | | Global Trade Identification Number | 05413278323354 | | Included Components | 1 x tube of Dow Corning 791 in Black. | | Item Dimensions | 50 x 50 x 235 millimetres | | Item Form | Liquid | | Item Type Name | External Weatherproofing Sealant | | Item Weight | 0.37 Kilograms | | Item dimensions L x W x H | 50 x 50 x 235 millimetres | | Item weight | 0.37 Kilograms | | Manufacturer | Dow Corning | | Manufacturer Part Number | 4024907/C05 | | Material | Silicone | | Model Number | 4024907/C05 | | Number of Items | 1 | | Product Warranty | No guarentee. | | Style | Compact | | Style Name | Compact | | Supported Standards | ISO 11600, ISO 9047 | | Surface Recommendation | Roof | | Unit Count | 310.0 millilitre | | Water Resistance Level | Water Resistant | | Water resistance level | Water Resistant | ## Product Details - **Brand:** Dowsil - **Item dimensions L x W x H:** 50 x 50 x 235 millimetres - **Item weight:** 0.37 Kilograms - **Material:** Silicone - **Style:** Compact ## Images ![Dowsil 791 Sealant Black 310ml - Image 1](https://m.media-amazon.com/images/I/61JyOwnIiHL.jpg) ![Dowsil 791 Sealant Black 310ml - Image 2](https://m.media-amazon.com/images/I/41ktMlfbszL.jpg) ![Dowsil 791 Sealant Black 310ml - Image 3](https://m.media-amazon.com/images/I/31t4wDdxOKL.jpg) ## Questions & Answers **Q: I need to seal around an inset kitchen sink. Tried wickes clear and it goes white when wet. Will this do the job for me?** A: Yes... good stuff for that or Sunday poly is also very good... different colours. . White is the most popular. **Q: Does it stick glass** A: I used this product to craete a seal round an outdoor 1 metre square manhole 'drain cover' over a year ago and it has not 'degraded' at all since it was applied. I might be wrong, but I would be fairly confident that it would stick glass pretty well. Care would be needed to avoid 'smearing' the glass tho' as it is very 'smeary and sticky Black rubbery stuff'. Good Luck. **Q: Would this stick a rubber seal to a runner for bifold doors?** A: I’m not sure, I used it to seal around my sink area. I don’t even know if it’s waterproof but it works and is still there a year later . **Q: Is this okay to use with leds?** A: Hi, it shouldn't be a problem to use with leds. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Would recommend *by E***S on 4 June 2026* Strong bond very strong not watery like other reviews said perfect for letting me watertight seal boats and bait boats flex able but no tare ### ⭐⭐⭐⭐⭐ Quality sealant - A1 *by R***. on 13 November 2023* I bought this for a seal i needed around a black wooden outdoor unit, where I had some gaps from a pipe I had going through it. It sealed easily and was black to match the unit etc. Went off fairly fast and has remained ever since doing its job - Sealing. Cheap, easy to use and very effective. A1 Product ### ⭐⭐⭐⭐ Black, easy to apply, can be messy *by B***R on 21 May 2020* The price is good and delivery was quick. The sealant tube is as easy to use as any other sealant tube (though you'll need to provide your own nozzle). Adhesion is good but not great, so you can get some stray blobs, and with the black dye those blobs can soon make your clothes a mess... be careful out there! ## Frequently Bought Together - Dowsil 791 Sealant Black 310ml - 791 Silicone Sealant Grey 310ml - Dowsil 785N Silicone Sealant, White 310ml --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/51559277-dowsil-791-sealant-black-310ml](https://www.desertcart.co.uk/products/51559277-dowsil-791-sealant-black-310ml) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-30*