---
product_id: 48422484
title: "HPRS25L 2.5L Thompsons High Performance Roof Seal - Black | Temperature-resistant coating for overhead substrates, providing waterproofing and weather exposure protection."
brand: "ronseal"
price: "€ 83.34"
currency: EUR
in_stock: true
reviews_count: 8
category: "Ronseal"
url: https://www.desertcart.hr/products/48422484-hprs25l-2-5l-thompsons-high-performance-roof-seal-black-temperature
store_origin: HR
region: Croatia
---

# UV-resistant iron oxide pigments 2.5L easy-apply sealant volume 10-year weatherproof shield HPRS25L 2.5L Thompsons High Performance Roof Seal - Black | Temperature-resistant coating for overhead substrates, providing waterproofing and weather exposure protection.

**Brand:** ronseal
**Price:** € 83.34
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal your roof, secure your peace of mind — 10 years of leak-proof confidence!

## Quick Answers

- **What is this?** HPRS25L 2.5L Thompsons High Performance Roof Seal - Black | Temperature-resistant coating for overhead substrates, providing waterproofing and weather exposure protection. by ronseal
- **How much does it cost?** € 83.34 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/48422484-hprs25l-2-5l-thompsons-high-performance-roof-seal-black-temperature)

## 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

- • **Trusted by DIY Pros:** Highly rated with 4.4 stars and a proven track record of stopping leaks effectively.
- • **UV Armor Technology:** Iron oxide pigments create a robust barrier against harsh UV rays, maintaining seal integrity.
- • **Decade-Long Durability:** Engineered to flex with roof movement, preventing cracks and splits for 10 years.
- • **Effortless Application:** Generous 2.5L volume with smooth consistency for seamless DIY roof repairs.
- • **Versatile Roof Compatibility:** Perfect for resealing and repairing a variety of roofing materials with professional results.

## Overview

The HPRS25L 2.5L Thompsons High Performance Roof Seal in black is a premium, UV-resistant roof coating designed to protect roofing membranes from cracking and weather damage for up to 10 years. Featuring iron oxide pigments for superior UV stability and a flexible formula that adapts to roof movement, this 2.5L sealant offers an easy-to-apply, durable solution ideal for DIY enthusiasts and professionals alike seeking long-lasting roof protection.

## Description

Contains benzisothiazolone. May produce an allergic reaction. Contains sensitizing substances. May produce an allergic reaction. Safety data sheet available on request. The Thompsons RSLHPRS25L Roof Seal Black comes in the following The 10 year formulation is designed to flex with the natural movement of the roof protecting the membrane from cracking and splitting over time UV light stable iron oxide pigments provide a protective shield against harmful UV radiation ensuring 10 year weatherproofing performance under extreme conditions

Review: Good quality product but time will tell whether it works - I have a flat roof above my kitchen that has not given me any hassle until recently when there was a thunder storm after a particularly hot dry period. The roof leaked and water poured into the kitchen ceiling and down the light fitting onto the floor. Luckily I did not turn the light on other wise I would probably have been frazzled in a Scooby Doo type, hair sticking on end and bulging eyes kind of way. Having phoned three local roofing companies, none of whom turned up to quote for the work, I decided to take matters into my own hands and, after watching a couple of YouTube videos, I decided that a sealant was what was needed to repair the thin worn roofing felt. Having gingerly climbed onto the roof through the window to the spare room and decided that the roof would be able to take my weight and I would not be disappearing into the casserole pot which was bubbling away on the stove, I inspected the damage properly. It seems that what had happened was that the roofing felt had worn so thin that it had become porous along the edges of the roof timbers that were spaced every 10am or so. I was tempted to pour a bucket of water over the roof to test this theory but decided against it as I did not want dirty water in my chicken casserole. This tin of roof seal arrived promptly with easy to understand (even for me) instructions and a plastic lid that was easy to open. It seems that this product needs no stirring (I didn't stir it up anyway) and is fairly order less. At first appearance the substance in the pot was grey rather than black as claimed, not that I was concerned about the sartorial qualities of the liquid too much, more of its ability to stop my ceiling from leaking. I had found an old paint brush that had been used before and had cleaned up reasonably well and started to apply the paint to the roof. Being so dry, the roof soaked up the paint very hungrily and seemed to drain my brush as soon as it had made contact with the horizontal surface. I had selected a brush around 10cm wide that could fit into the paint pot tub to charge the brush in one single dipping motion which was more efficient than getting a wider brush that would have required dipping at each angle to be fully charged. Sensibly, I started at the very edge of the roof and tried not to look down too much at the patio furniture below that would probably have broken my fall along with several bones in my body. I went as close to the edge as I could stomach and even managed to clear some leaves out of the gutter before applying the paint to the rough felt. The trick to this is to make sure that the paint is evenly applied and that no area of the roof is missed which is not as easy as it sounds when you are on your hands and knees on a roof in the blazing sun with a chicken casserole on the stove in the kitchen sending up even more heat. I elected to do this bare foot so I could be as fleet as possible and also shirtless so I didn't spoil one of my shirts. My shorts took a bit of a hammering though and they looked pretty splattered at the end, I do not expect that this stuff washes off and I am not going to try as I quite like the effect which is an added bonus. This is quite hard on the knees too, particularly on the rough bits and the bits on the felt graze against knee and heel tissue quite fiercely. After around an hour the deed was done and I inspected my efforts. As the paint dries patches form and it is clear that some areas are maybe too thinly coated and it all looks a but disappointing at first but as the solution evaporates further the surface becomes clearer. This is pretty intense stuff and if the degree to which it sticks to your skin (I got a lot of it on me rather than the roof) is a reflection as to how well it sticks to a roof then it is very good stuff indeed. It comes with a 10 year guarantee which seems impressive, however I cannot imagine many people will have the receipt or the aptitude to challenge this if, say, in 8 years time there is a leak would you really a. still have the receipt, b. be able to prove the leak had been caused by the product c. know who to contact to complain d. go to all this bother for something that had cost around £20. I think not. At the very least I have saved on the cost of a roofer coming out even though the experience has cost me around £20, a couple of hours of my life and several layers of skin on my knees. By the way, it was too hot to eat the chicken casserole and I had a salad instead.
Review: Seems almost to good to be true. Perfect - Have used this recently. It was easy to use not like the bitumen based sealants I've used in the past. It seems to be perfect for sealing any leaking flat roofs only time will tell if it continues to do the job but so far this is the best roof water sealant I've ever used.

## Features

- Contains benzisothiazolone. May produce an allergic reaction.
- Contains sensitizing substances. May produce an allergic reaction.
- Safety data sheet available on request.
- The Thompsons RSLHPRS25L Roof Seal Black comes in the following
- The 10 year formulation is designed to flex with the natural movement of the roof protecting the membrane from cracking and splitting over time
- UV light stable iron oxide pigments provide a protective shield against harmful UV radiation ensuring 10 year weatherproofing performance under extreme conditions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001GU6HZK |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 43,014 in DIY & Tools ( See Top 100 in DIY & Tools ) 30 in Roof Coatings & Paints |
| Colour | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (543) |
| Date First Available | 1 May 2007 |
| Included Components | Mounting Hardware, User Manual |
| Item Package Quantity | 1 |
| Item Weight | 1.7 kg |
| Item model number | RSLHPRS25L |
| Manufacturer | Ronseal |
| Material | Iron Oxide |
| Part Number | RSLHPRS25L |
| Product Dimensions | 16.3 x 16 x 16.5 cm; 1.7 kg |
| Shape | Round |
| Size | 2.5L |
| Voltage | 100 Volts |
| Wattage | 6 watts |

## Images

![HPRS25L 2.5L Thompsons High Performance Roof Seal - Black | Temperature-resistant coating for overhead substrates, providing waterproofing and weather exposure protection. - Image 1](https://m.media-amazon.com/images/I/61MxsaQ2A+L.jpg)

## Questions & Answers

**Q: what area will 1ltre cover**
A: A 2.5l can wil cover 2.5sq meters of felt painted twice. Hope that helps

**Q: Still wet after 20 hours?? Anyone else experience this?**
A: Depends on temp. but should be dry within 20 hrs. However if it waservice for proper advice.s applied to a moist surface perhaps this affects the drying cycle, suggest you contact manufacturer

**Q: can it be used over lead flashing?**
A: I'm not sure but if you can use it over roofing felt I would guess that you could

**Q: can it be applied to felt that was torn in a gale**
A: Yes, it can as long as you manage to flatten it down again

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good quality product but time will tell whether it works
*by P***L on 6 August 2018*

I have a flat roof above my kitchen that has not given me any hassle until recently when there was a thunder storm after a particularly hot dry period. The roof leaked and water poured into the kitchen ceiling and down the light fitting onto the floor. Luckily I did not turn the light on other wise I would probably have been frazzled in a Scooby Doo type, hair sticking on end and bulging eyes kind of way. Having phoned three local roofing companies, none of whom turned up to quote for the work, I decided to take matters into my own hands and, after watching a couple of YouTube videos, I decided that a sealant was what was needed to repair the thin worn roofing felt. Having gingerly climbed onto the roof through the window to the spare room and decided that the roof would be able to take my weight and I would not be disappearing into the casserole pot which was bubbling away on the stove, I inspected the damage properly. It seems that what had happened was that the roofing felt had worn so thin that it had become porous along the edges of the roof timbers that were spaced every 10am or so. I was tempted to pour a bucket of water over the roof to test this theory but decided against it as I did not want dirty water in my chicken casserole. This tin of roof seal arrived promptly with easy to understand (even for me) instructions and a plastic lid that was easy to open. It seems that this product needs no stirring (I didn't stir it up anyway) and is fairly order less. At first appearance the substance in the pot was grey rather than black as claimed, not that I was concerned about the sartorial qualities of the liquid too much, more of its ability to stop my ceiling from leaking. I had found an old paint brush that had been used before and had cleaned up reasonably well and started to apply the paint to the roof. Being so dry, the roof soaked up the paint very hungrily and seemed to drain my brush as soon as it had made contact with the horizontal surface. I had selected a brush around 10cm wide that could fit into the paint pot tub to charge the brush in one single dipping motion which was more efficient than getting a wider brush that would have required dipping at each angle to be fully charged. Sensibly, I started at the very edge of the roof and tried not to look down too much at the patio furniture below that would probably have broken my fall along with several bones in my body. I went as close to the edge as I could stomach and even managed to clear some leaves out of the gutter before applying the paint to the rough felt. The trick to this is to make sure that the paint is evenly applied and that no area of the roof is missed which is not as easy as it sounds when you are on your hands and knees on a roof in the blazing sun with a chicken casserole on the stove in the kitchen sending up even more heat. I elected to do this bare foot so I could be as fleet as possible and also shirtless so I didn't spoil one of my shirts. My shorts took a bit of a hammering though and they looked pretty splattered at the end, I do not expect that this stuff washes off and I am not going to try as I quite like the effect which is an added bonus. This is quite hard on the knees too, particularly on the rough bits and the bits on the felt graze against knee and heel tissue quite fiercely. After around an hour the deed was done and I inspected my efforts. As the paint dries patches form and it is clear that some areas are maybe too thinly coated and it all looks a but disappointing at first but as the solution evaporates further the surface becomes clearer. This is pretty intense stuff and if the degree to which it sticks to your skin (I got a lot of it on me rather than the roof) is a reflection as to how well it sticks to a roof then it is very good stuff indeed. It comes with a 10 year guarantee which seems impressive, however I cannot imagine many people will have the receipt or the aptitude to challenge this if, say, in 8 years time there is a leak would you really a. still have the receipt, b. be able to prove the leak had been caused by the product c. know who to contact to complain d. go to all this bother for something that had cost around £20. I think not. At the very least I have saved on the cost of a roofer coming out even though the experience has cost me around £20, a couple of hours of my life and several layers of skin on my knees. By the way, it was too hot to eat the chicken casserole and I had a salad instead.

### ⭐⭐⭐⭐⭐ Seems almost to good to be true. Perfect
*by M***N on 18 May 2026*

Have used this recently. It was easy to use not like the bitumen based sealants I've used in the past. It seems to be perfect for sealing any leaking flat roofs only time will tell if it continues to do the job but so far this is the best roof water sealant I've ever used.

### ⭐⭐⭐⭐ A stylish charcoal colour
*by D***T on 11 May 2023*

The only reason I did not rate longevity is that I only today applied this roof seal. The first thing to notice is that it was a stylish charcoal colour rather than pure black. Easy to apply. It does make me feel more reassured about my shed roof.

## Frequently Bought Together

- HPRS25L 2.5L Thompsons High Performance Roof Seal - Black
- Faithfull Tar Brush Short Handle FAIBRTARSH

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-17*