---
product_id: 311333893
title: "Dowsil - 791 Silicone Sealant Black 310ml"
brand: "dowsil"
price: "R1060"
currency: ZAR
in_stock: true
reviews_count: 5
category: "Dowsil"
url: https://www.desertcart.co.za/products/311333893-dowsil-791-silicone-sealant-black-310ml
store_origin: ZA
region: South Africa
---

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

**Brand:** dowsil
**Price:** R1060
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the deal with speed and strength!

## Quick Answers

- **What is this?** Dowsil - 791 Silicone Sealant Black 310ml by dowsil
- **How much does it cost?** R1060 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/311333893-dowsil-791-silicone-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 & ISO 9047 Class 50 standards for professional-grade reliability
- • **Universal Adhesion:** Bonds flawlessly to both porous and non-porous surfaces without primer
- • **Weatherproof Mastery:** Unmatched resistance to weathering and radiation for lasting protection
- • **Rapid Seal Technology:** Tack free in just 2 hours to keep your projects moving
- • **Precision Working Window:** 20-30 minutes of smooth application before setting

## Overview

Dowsil 791 is a premium black silicone sealant designed for external weatherproofing. It offers excellent adhesion without primer, resists extreme temperatures and radiation, cures quickly within 2 hours, and complies with top ISO standards, making it the go-to choice for durable, professional sealing solutions.

## Description

Dow corning 791 external weatherproofing sealant is an external weatherproofing neutral silicone sealant. It is a one part sealant that gives excellent un-primed adhesion to both porous and non-porous construction substrates.

Review: Sehr gutes Produkt
Review: Not happy that I was delivered a sealant that is two weeks away from it's expiry date!

## 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 |
| ASIN  | B0063PXFE4 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #88,280 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #210 in Silicone Sealers #475 in Hardware Sealers |
| Color | Black |
| Customer Reviews | 4.2 4.2 out of 5 stars (333) |
| Customer reviews | 4.2 4.2 out of 5 stars (333) |
| Date First Available | 28 August 2014 |
| Date First Available  | 28 August 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 |
| Item model number  | 4024907/C05 |
| Manufacturer | Dow Corning |
| 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 |
| 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 millimeters
- **Item weight:** 0.37 Kilograms
- **Material:** Silicone
- **Style:** Compact

## Images

![Dowsil - 791 Silicone Sealant Black 310ml - Image 1](https://m.media-amazon.com/images/I/61JyOwnIiHL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by H***N on 21 January 2026*

Sehr gutes Produkt

### ⭐ Review
*by P***T on 23 July 2022*

Not happy that I was delivered a sealant that is two weeks away from it's expiry date!

### ⭐⭐⭐⭐⭐ Review
*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.

## 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.za/products/311333893-dowsil-791-silicone-sealant-black-310ml](https://www.desertcart.co.za/products/311333893-dowsil-791-silicone-sealant-black-310ml)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-16*