---
product_id: 50240981
title: "TERRM750 Thompsons Emergency Roof Repair Mastic 750 ml | Thompson's Emergency Roof Repair Mastic | Size: 750ml | Trowel-applied roof repair mastic | Adheres to virtually any roofi"
brand: "ronseal"
price: "40821CFA"
currency: XOF
in_stock: true
reviews_count: 8
category: "Ronseal"
url: https://www.desertcart.sn/products/50240981-terrm750-thompsons-emergency-roof-repair-mastic-750-ml-thompsons-emergency
store_origin: SN
region: Senegal
---

# Waterproof adhesion 1-day full cure High-strength filler TERRM750 Thompsons Emergency Roof Repair Mastic 750 ml | Thompson's Emergency Roof Repair Mastic | Size: 750ml | Trowel-applied roof repair mastic | Adheres to virtually any roofi

**Brand:** ronseal
**Price:** 40821CFA
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the deal before the drip steals your peace of mind!

## Quick Answers

- **What is this?** TERRM750 Thompsons Emergency Roof Repair Mastic 750 ml | Thompson's Emergency Roof Repair Mastic | Size: 750ml | Trowel-applied roof repair mastic | Adheres to virtually any roofi by ronseal
- **How much does it cost?** 40821CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/50240981-terrm750-thompsons-emergency-roof-repair-mastic-750-ml-thompsons-emergency)

## Best For

- ronseal enthusiasts

## Why This Product

- Trusted ronseal brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Flexible Yet Durable:** Skins over but stays flexible to last until permanent repairs.
- • **Instant Leak Defense:** Perfect for emergency roof repairs when you need it most.
- • **Oil Rig Tough Technology:** Developed from North Sea oil rig tech for unmatched durability.
- • **Unstoppable Waterproof Seal:** Adheres underwater to stop leaks instantly, rain or shine.
- • **Ergonomic & Easy Application:** Trowel-applied with ergonomic design for quick, mess-free fixes.

## Overview

Ronseal TERRM750 Thompsons Emergency Roof Repair Mastic is a 750 ml high-viscosity, waterproof mastic designed for rapid, durable roof crack and leak repairs. Engineered with oil rig technology, it adheres underwater and to virtually any roofing material, curing fully in 1 day while remaining flexible to withstand weather stress. Ideal for emergency fixes, it offers easy trowel application and long-lasting protection.

## Description

Product Description Thompson's Emergency Roof Repair Mastic has been developed from technology used on North Sea oil rigs, Thompson's Emergency Roof Repair Mastic is a trowel applied mastic with the ability to adhere to virtually any roofing material even underwater. With added fibres and a high solids content, Thompson's Emergency Roof Repair Mastic has been developed for filling, plugging and repairing cracks and splits, targeting leaks at the source of the problem. Box Contains 1x 750 ml Thompsons Emergency Roof Repair Mastic

Review: Good for that emergency repair - Application was easy, even in the rain, and has filled some large cracks in the roof covering that have appeared during the last 12 months but which had gone unnoticed until the heavy and frequent rain showers that substituted for "summer 2024". Have reapplied where I wasn't convinced that the coverage was adequate, even though the underside of the roof was drying out; this revealed that the mastic "skins" but stays flexible, which bolds well for lasting until I can effect a more permanent repair. TBH, this surpassed my expectations so I am more that pleased with the outcome, thus far.
Review: Quick and easy to block leaks - This Ronseal Roof Repair is like thick tar. You can put it on the roof even in the wet but make sure you wear gloves as it's not easy to get it off your skin. I've been using this stuff for years across various different houses with flat rooves and it's great, I wouldn't be without it as you only discover a leak when it's raining and this roof sealer can solve the problem instantly.

## Features

- Flammable liquid and vapour.
- May cause drowsiness or dizziness.
- Repeated exposure may cause skin dryness or cracking.
- Easy application
- Ergonomic design
- Easy to use

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002SHSZYQ |
| Best Sellers Rank | 176,468 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,975 in Sealers |
| Brand | Ronseal |
| Colour | Black |
| Compatible Material | Metal |
| Container Type | Tube |
| Customer Reviews | 4.6 out of 5 stars 202 Reviews |
| Full Cure Time | 1 Days |
| Global Trade Identification Number | 05010214860821 |
| Included Components | 1 piece |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Volume | 750 Millilitres |
| Item Weight | 1.01 Kilograms |
| Item form | Liquid |
| Manufacturer | Ronseal |
| Manufacturer Part Number | RSLTERRM750 |
| Material | Mastic |
| Model Number | RSLTERRM750 |
| Other Special Features of the Product | Adhesive Underwater, High-Strength Filling Ability |
| Special feature | Adhesive Underwater, High-Strength Filling Ability |
| Specific Uses For Product | roof |
| Specific uses for product | roof |
| Unit Count | 750.0 millilitre |
| Viscosity Level | High |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Ronseal
- **Item form:** Liquid
- **Material:** Mastic
- **Special feature:** Adhesive Underwater, High-Strength Filling Ability
- **Specific uses for product:** roof

## Images

![TERRM750 Thompsons Emergency Roof Repair Mastic 750 ml | Thompson's Emergency Roof Repair Mastic | Size: 750ml | Trowel-applied roof repair mastic | Adheres to virtually any roofi - Image 1](https://m.media-amazon.com/images/I/716kyPHScAL.jpg)

## Questions & Answers

**Q: what is the coverage of a 750ml tin**
A: On the tin it says 0.13 sq metres assuming the depth of application is 6mm.

**Q: We’ve just applied it now (9pm). Forecast is dry overnight and hot tomorrow. When can I expect it to be completely dry?**
A: It should be dry within 24 hours  but  this weather probably 12 it will react with hot  sun like road tar and melt into some of holes / cracks so may be worth leaving a while and reapplying on large cracks to make sure it’s totally weather proof for wet weather that’s what I have done

**Q: Can i use a brush**
A: No you cannot use brush. You have to use trowel. The stuff is not soft to use a brush.

**Q: My garage felt only has slight cracks. I wanted to repair it before it gets worse. Will this do the job??**
A: Yes, this will do the job very effectively. It is a thick-ish rubberised paste, which goes on well when applied with a putty knife or similar. It will easily fill and seal gaps up to 5 or 6mm wide with no problems. I would recommend it.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good for that emergency repair
*by P***Y on 6 October 2024*

Application was easy, even in the rain, and has filled some large cracks in the roof covering that have appeared during the last 12 months but which had gone unnoticed until the heavy and frequent rain showers that substituted for "summer 2024". Have reapplied where I wasn't convinced that the coverage was adequate, even though the underside of the roof was drying out; this revealed that the mastic "skins" but stays flexible, which bolds well for lasting until I can effect a more permanent repair. TBH, this surpassed my expectations so I am more that pleased with the outcome, thus far.

### ⭐⭐⭐⭐⭐ Quick and easy to block leaks
*by I***Y on 27 October 2024*

This Ronseal Roof Repair is like thick tar. You can put it on the roof even in the wet but make sure you wear gloves as it's not easy to get it off your skin. I've been using this stuff for years across various different houses with flat rooves and it's great, I wouldn't be without it as you only discover a leak when it's raining and this roof sealer can solve the problem instantly.

### ⭐⭐⭐⭐ It Looks Like It Does The Job....
*by J***P on 30 January 2023*

My 2 year old garden shed recently began to leak. I suspected the water was getting in past the felt nails, as they had been hammered in slightly too far, and had left a minute gap around some of the nail heads. I initially tried using black bitumen paint, but this didn't provide a complete cure, as the inside of the shed roof was still wet to the touch. I needed something more substantial, and this stuff seemed like it could offer the solution. So, having got myself a 750ml tin from Amazon, I gave it a go, spreading it on and around the suspect area, covering the nail heads and any overlaps on the felt. It is fairly easy to apply, but it's best to wear gloves, and have white spirt handy to wipe up spills and unintentional smudges on clothes. From reading the instructions on the tin, a thick ( around 3mm ) applications is best. It does look like it is going to do the job, but as I type this there has been no prolonged rain in my area, hence the 4 stars for the overall rating. I remain confident, and would use this stuff again if needed.....

## Frequently Bought Together

- Ronseal TERRM750 Thompsons Emergency Roof Repair Mastic 750 ml, Black
- fowong Waterproof Tape, 50mm(W) x 5M(L) Butyl Tape, Waterproof Tape for Leaks and Outdoor Use, Flashing Tape for Roof Sealant, Roof Repair Tape for Repairing Roof Crack, Gutter, RV Repair

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-08-21*