--- product_id: 50254794 title: "HPRSBL4L Thompsons High Performance Roof Seal Black 4 Litre | Weatherproof coating for overhead substrates, providing durable waterproofing and moisture ingress resistance." brand: "ronseal" price: "$161.27" currency: USD in_stock: true category: "Ronseal" url: https://www.desertcart.us/products/50254794-hprsbl4l-thompsons-high-performance-roof-seal-black-4-litre-weatherproof store_origin: US region: United States of America --- # UV stable iron oxide pigments Flexible black membrane 10-year weatherproofing HPRSBL4L Thompsons High Performance Roof Seal Black 4 Litre | Weatherproof coating for overhead substrates, providing durable waterproofing and moisture ingress resistance. **Brand:** ronseal **Price:** $161.27 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal it, shield it, forget it – 10 years of roof confidence! ## Quick Answers - **What is this?** HPRSBL4L Thompsons High Performance Roof Seal Black 4 Litre | Weatherproof coating for overhead substrates, providing durable waterproofing and moisture ingress resistance. by ronseal - **How much does it cost?** $161.27 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/50254794-hprsbl4l-thompsons-high-performance-roof-seal-black-4-litre-weatherproof) ## 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 - • **Resealable & Ready:** Comes in a convenient 4L tin with a resealable lid for easy storage and multiple applications. - • **UV Armor Technology:** Iron oxide pigments shield your roof from harsh UV rays, maintaining performance under extreme sunlight. - • **Decade-Long Durability:** Protect your roof with a 10-year flexible seal that moves with your home, preventing cracks and splits. - • **Breathable Waterproof Barrier:** Advanced vapour permeable membrane lets trapped moisture escape while keeping water out. - • **Versatile Surface Compatibility:** Ideal for roofs and multiple materials including wood, concrete, metal, and composites. ## Overview Ronseal Thompsons High Performance Roof Seal Black 4 Litre is a premium, flexible roof coating designed to protect and repair roofing surfaces for up to 10 years. Featuring UV-stable iron oxide pigments and a vapour permeable membrane, it prevents cracking, resists weather damage, and allows moisture to escape, ensuring long-lasting waterproof protection across various materials. ## Description Product Description Thompson's 10 Year Roof Seal is a high performance coating which cures to form a durable, flexible membrane suitable for resealing and protecting whole roofs or repairing large areas of damage to a variety of roofing materials. 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. For best results the advanced formula should be applied directly to dry surfaces, the 10 year formulation forms a vapour permeable membrane that repairs and weatherproofs whilst allowing any trapped moisture in the substrate to escape. This product is supplied in a tin with re-sealable lid and the following specifications: Colour: Black. Available Sizes: 1L, 2.5L or 4L. Box Contains 1x 4 Litre Roof Seal ## Features - Contains 1,2-benzisothiazol-3(2H)-one and reaction mass of 5-chloro-2-methyl-2H- isothiazol-3-one and 2-methyl-2H-isothiazol-3-one (3:1). May produce an allergic reaction. - The Thompsons RSLHPRSBL4L 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 | B001GU6I04 | | Best Sellers Rank | 74,899 in DIY & Tools ( See Top 100 in DIY & Tools ) 59 in Roof Coatings & Paints 5,406 in Adhesives & Sealers | | Brand | Ronseal | | Colour | Black | | Compatible Material | Roof, potentially other materials such as wood, concrete, metal, and various types of plastics or composite materials | | Country Of Origin | United Kingdom | | Customer Reviews | 4.5 4.5 out of 5 stars (268) | | EU Spare Part Availability Duration | 10 Years | | Included Components | Mounting Hardware||User Manual | | Item Dimensions | 18 x 18 x 19 centimetres | | Item Form | Liquid | | Item Weight | 4 Kilograms | | Manufacturer | Ronseal | | Manufacturer Part Number | RSLHPRSBL4L | | Material | Iron Oxide | | Model Number | RSLHPRSBL4L | | Number of Items | 1 | | Number of Packs | 1 | | Style Name | Compact | | Surface Recommendation | Roof | | Unit Count | 1.0 count | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** Ronseal - **Item dimensions L x W x H:** 18 x 18 x 19 centimetres - **Item weight:** 4 Kilograms - **Material:** Iron Oxide - **Style:** Compact ## Images ![HPRSBL4L Thompsons High Performance Roof Seal Black 4 Litre | Weatherproof coating for overhead substrates, providing durable waterproofing and moisture ingress resistance. - Image 1](https://m.media-amazon.com/images/I/61PyaR2LixL.jpg) ## Questions & Answers **Q: Hi - Can this product be applied direct to wood?** A: Applied just like paint, nothing on the tin that says it cannot be applied directly to wood. I stopped a leak on my roof wEr by the productextension 2yrs ago, so I would s **Q: any idea on approximate coverage? Just need an good guesstimate so I know how many to order. Thanks** A: I would agree with the previous answer from Brownie as to coverage for a single coat, and would recommend giving more than one coat. make sure the surface being painted is dry, and that rain is not forecast for the period while the paint will still be wet. **Q: whats the best type of brush to use for a felr roof?** A: It's consistency is quite thin so a brush of any sort and size - the bigger the area, the larger the brush.The dormer I did was approx. 30 square metres, so I used a roller. **Q: Does it come in white** A: No, it actually goes black ## Frequently Bought Together - Ronseal HPRSBL4L Thompsons High Performance Roof Seal Black 4 Litre - ProDec 4 inch Flat Masonry Paint Brush for Rapid Application of Smooth and Textured Masonry Paints on Outdoor Walls, Brick, Breeze Block, Render, Pebbledash and Other Rough Surfaces, 4" 100mm --- ## 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.us/products/50254794-hprsbl4l-thompsons-high-performance-roof-seal-black-4-litre-weatherproof](https://www.desertcart.us/products/50254794-hprsbl4l-thompsons-high-performance-roof-seal-black-4-litre-weatherproof) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-29*