---
product_id: 311333893
title: "Dowsil - 791 Silicone Sealant Black 310ml"
brand: "dowsil"
price: "S$62"
currency: SGD
in_stock: true
reviews_count: 5
category: "Dowsil"
url: https://www.desertcart.sg/products/311333893-dowsil-791-silicone-sealant-black-310ml
store_origin: SG
region: Singapore
---

# 20-30 min working time Fast cure: tack free in 2 hours Resists extreme temps & radiation Dowsil - 791 Silicone Sealant Black 310ml

**Brand:** dowsil
**Price:** S$62
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal it like a pro—weatherproof your world with confidence!

## Quick Answers

- **What is this?** Dowsil - 791 Silicone Sealant Black 310ml by dowsil
- **How much does it cost?** S$62 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/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

- • **Speedy Seal:** Work fast with 20-30 minutes open time and tack-free cure in 2 hours
- • **Sleek Black Finish:** Perfectly blends with dark surfaces for a professional look
- • **Weatherproof Mastery:** Unmatched external durability for all climates
- • **ISO Certified Quality:** Meets ISO 11600-25lm & ISO 9047 Class 50 standards for peace of mind
- • **Effortless Application:** One-part formula with excellent adhesion—no primer needed

## Overview

Dowsil 791 is a premium black silicone sealant designed for external weatherproofing. It offers excellent adhesion without primer on porous and non-porous surfaces, resists extreme temperatures and radiation, and cures quickly within 2 hours. Certified to ISO standards, it ensures reliable, long-lasting seals ideal for professional-grade outdoor applications.

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

## 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 | #32,817 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #94 in Silicone Sealers #197 in Hardware Sealers |
| Color | Black |
| Customer Reviews | 4.2 4.2 out of 5 stars (332) |
| Customer reviews | 4.2 4.2 out of 5 stars (332) |
| 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 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.

### ⭐⭐⭐⭐⭐ Review
*by D***K on 7 July 2025*

What can one say about a tube of sealant? Does it seal? Yes.

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

---

*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-01-25*