10 Best Brick Water Sealer 2025 in the UK

The Stormdry Masonry Waterproofing Cream is a versatile and high-strength sealer ideal for various surfaces, including brick, stone, mortar, sandstone, and granite. It offers significant protection by creating a deeply penetrating, invisible water-repellent barrier that promises up to 25 years of durability, backed by BBA certification.

A key advantage is its breathability, allowing moisture to escape while preventing water ingress, potentially extending the lifespan of your walls and maintaining the thermal properties of cavity insulation. This breathable quality ensures that the walls can dry naturally, preventing dampness without compromising insulation efficiency. The product is also colorless, which means it will not alter the appearance of your masonry, preserving its natural look.

One of its highlights is the ease of application; a single coat is often sufficient, making it a convenient solution for DIY enthusiasts. However, the product's UV resistance isn't explicitly mentioned, which could be a consideration for those in highly sunny regions. For anyone looking to protect their masonry surfaces from water damage while maintaining breathability and natural appearance, this product seems like a solid choice.

The RONSEAL 36286 Thompsons Water Seal is a clear, silicone-based sealer designed for protecting brick, concrete, and stone surfaces. One of its handy features is that you can apply it directly to damp surfaces, which makes the process more convenient since you don’t have to wait for everything to dry first. It also helps prevent damage caused by freeze-thaw cycles, which is great if you live in a climate with cold winters. This sealer dries fairly quickly, within about 2 hours, and a 5-litre can covers roughly 20 square meters, so it’s suitable for medium-sized projects.

It forms a water-repellent layer that helps protect surfaces from moisture without completely sealing them off, allowing the material to breathe and avoid trapped dampness which can cause bigger problems. The clear finish keeps the natural look of your bricks and stones, so it doesn’t change their appearance. Silicone-based sealers generally provide decent protection against sunlight damage. Its durability is good for standard outdoor use, but heavy wear or extreme weather over time might require reapplication.

This product is a reliable choice for homeowners seeking an easy-to-use, effective water sealer that maintains the look of their brick or stone surfaces while guarding against moisture and freeze damage.

Raincheck Water Seal 5 Litre utilises silicone hydrophobic technology to create a water-resistant barrier on surfaces like brick, stone, mortar, and concrete. Its breathable nature allows moisture to escape from the substrate, preventing damage from trapped water while offering excellent water repellency. The colorless, solvent-free formula is eco-friendly and boasts low VOCs, making it a suitable option for those concerned with environmental impact.

Application is versatile, as it can be applied using a brush, roller, or sprayer, enhancing convenience for various projects. It effectively bridges hairline cracks and provides UV resistance, ensuring long-term performance without degradation from sun exposure. Additionally, its durability is noteworthy, offering protection against frost and de-icing salts through thermal insulation properties, making it suitable for harsh weather conditions.

One limitation might be its specific use for certain materials, requiring consideration of substrate compatibility. It has received positive feedback with a 4.4-star rating from over 2,000 reviews, indicating general customer satisfaction. This product is an excellent choice for those needing a reliable and eco-friendly water seal for various exterior surfaces.