---
product_id: 51559277
title: "791 Sealant Black 310ml"
brand: "dowsil"
price: "£11.00"
currency: GBP
in_stock: true
category: "Dowsil"
url: https://www.desertcart.co.uk/products/51559277-791-sealant-black-310ml
store_origin: GB
region: United Kingdom
---

# 20-30 min working time UV & weather resistant Resists extreme temperatures 791 Sealant Black 310ml

**Brand:** dowsil
**Price:** £11.00
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the deal with confidence—weatherproof your world in style!

## Quick Answers

- **What is this?** 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/51559277-791-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

- • **Quick Tack-Free Cure:** Achieves a durable, tack-free finish in just 2 hours—get back to your day faster.
- • **Seamless Black Finish:** Perfectly matches black surfaces for a discreet, sleek seal that blends in flawlessly.
- • **ISO-Certified Reliability:** Meets ISO 11600-25lm and ISO 9047 Class 50 standards for professional-grade performance.
- • **Built to Brave the Elements:** Exceptional resistance to UV radiation and temperature extremes keeps seals intact year-round.
- • **Fast & Flexible Application:** Smooth 20-30 minute working window for precise sealing without rush.

## Overview

Dowsil 791 Sealant Black 310ml is a premium silicone-based external weatherproofing sealant designed for durable, flexible sealing on rubber and other surfaces. It offers excellent resistance to UV radiation and temperature extremes, cures quickly to a tack-free finish within 2 hours, and complies with rigorous ISO standards, making it the go-to choice for professional and DIY outdoor sealing projects.

## Description

Shop Dowsil 791 Sealant Black 310ml. Free delivery on eligible orders of £20 or more.

## 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 | 15,604 in DIY & Tools ( See Top 100 in DIY & Tools ) 324 in Sealers |
| Brand | Dowsil |
| Colour | Black |
| Compatible Material | Rubber |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.3 4.3 out of 5 stars (350) |
| 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 |
| Manufacturer | Dow Corning |
| Manufacturer Part Number | 4024907/C05 |
| Material | Silicone |
| Model Number | 4024907/C05 |
| Number of Items | 1 |
| Product Warranty | No guarentee. |
| Style Name | Compact |
| Supported Standards | ISO 11600, ISO 9047 |
| Surface Recommendation | Roof |
| Unit Count | 310.0 millilitre |
| 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

![791 Sealant Black 310ml - Image 1](https://m.media-amazon.com/images/I/61JyOwnIiHL.jpg)
![791 Sealant Black 310ml - Image 2](https://m.media-amazon.com/images/I/41ktMlfbszL.jpg)
![791 Sealant Black 310ml - Image 3](https://m.media-amazon.com/images/I/31t4wDdxOKL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## 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.

## Frequently Bought Together

- Dowsil 791 Sealant Black 310ml
- 791 Silicone Sealant Grey 310ml
- Dowsil 785N Silicone Sealant, White 310ml

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**Shop now:** [https://www.desertcart.co.uk/products/51559277-791-sealant-black-310ml](https://www.desertcart.co.uk/products/51559277-791-sealant-black-310ml)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-02*