---
product_id: 51559277
title: "Dowsil 791 Sealant Black 310ml"
brand: "dowsil"
price: "C$2275"
currency: NIO
in_stock: true
reviews_count: 10
category: "Dowsil"
url: https://www.desertcart.ni/products/51559277-dowsil-791-sealant-black-310ml
store_origin: NI
region: Nicaragua
---

# 20-30 min working time Fast cure, tack free in 2 hrs Withstands extreme temps Dowsil 791 Sealant Black 310ml

**Brand:** dowsil
**Price:** C$2275
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal it like a pro — fast, flawless, and built to last!

## Quick Answers

- **What is this?** Dowsil 791 Sealant Black 310ml by dowsil
- **How much does it cost?** C$2275 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/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

- • **Sleek Black Finish:** Blends seamlessly with dark surfaces for a professional, clean look that stands out.
- • **Weatherproof Mastery:** Engineered to resist harsh weather and UV radiation, keeping your projects flawless year-round.
- • **Rapid Seal Technology:** Achieves tack-free surface in just 2 hours, speeding up your project completion.
- • **Precision Working Window:** Offers a perfect 20-30 minute working time for meticulous application without rush.
- • **ISO Certified Reliability:** Meets ISO 11600-25lm and ISO 9047 Class 50 standards for guaranteed quality and performance.

## Overview

Dowsil 791 Sealant Black 310ml is a high-performance silicone sealant designed for outdoor and indoor use, offering excellent resistance to weather, radiation, and temperature extremes. It provides a 20-30 minute working time and cures quickly to a tack-free finish within 2 hours. Certified to ISO standards, this black sealant ensures durable, professional-grade sealing with a sleek finish.

## Description

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

Review: Great - This is great stuff I've never heard or seen this product before i needed something for outside and the internet recommended this. I have a black outdoor junction box that was leaking in the seal originally used was coming away from the wall ideally needed to replace the box but i have that weird pebbledash insulation stuff so a nightmare to screw into hence why i got this product to seal the back of the box onto the wall and a coat around the front cap to seal it from water.
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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 18,807 in DIY & Tools ( See Top 100 in DIY & Tools ) 376 in Sealers |
| Colour | Black |
| Customer Reviews | 4.2 4.2 out of 5 stars (348) |
| Date First Available | 28 Aug. 2014 |
| Included Components | 1 x tube of Dow Corning 791 in Black. |
| Item Package Quantity | 1 |
| Item Weight | 370 g |
| Item model number | 4024907/C05 |
| Manufacturer | Dow Corning |
| Material | Silicone |
| Measurement System | Metric |
| Number of Pieces | 1 |
| Part Number | 4024907/C05 |
| Product Dimensions | 5 x 5 x 23.5 cm; 370 g |
| Size | Size 310 |
| Style | Compact |

## 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)

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great
*by D***Y on 29 July 2025*

This is great stuff I've never heard or seen this product before i needed something for outside and the internet recommended this. I have a black outdoor junction box that was leaking in the seal originally used was coming away from the wall ideally needed to replace the box but i have that weird pebbledash insulation stuff so a nightmare to screw into hence why i got this product to seal the back of the box onto the wall and a coat around the front cap to seal it from water.

### ⭐⭐⭐⭐⭐ 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.ni/products/51559277-dowsil-791-sealant-black-310ml](https://www.desertcart.ni/products/51559277-dowsil-791-sealant-black-310ml)

---

*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-02-28*