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As the harsh Welsh winter gives way to the gentler breezes of spring, it’s the perfect time to think about outdoor maintenance—specifically, sealing your natural stone. Whether it’s a part of your patio, garden pathway, or a decorative feature, natural stone can last for generations if cared for properly. Here at Roman Building Landscapes, we believe in helping our clients enjoy their investments to the fullest, which is why we’ve put together this guide on how to seal natural stone.

Why Seal Natural Stone?

Natural stone, while durable and visually striking, is porous. This means it can absorb water, oils, and other liquids, which can lead to staining and damage over time, especially in our often unpredictable Welsh weather. Sealing the stone helps create a barrier that minimizes absorption, protects against stains, and extends the life of the stone.

Choosing the Right Sealant

The first step in sealing your stone is choosing the right sealant. There are two main types of sealants: penetrating and topical. Penetrating sealants absorb into the stone, providing protection without changing the stone’s appearance. Topical sealants sit on the surface of the stone, creating a shiny layer that can enhance the color. For most outdoor applications in Wales, we recommend a penetrating sealant as it offers durable protection without altering the natural beauty of the stone.


Before sealing, ensure that the stone is clean and dry. Begin by sweeping away any debris. For deeper cleaning, wash the stone with a cleaner suitable for natural stone, and avoid acidic cleaners that can etch the surface. Allow the stone to dry completely, which can take up to 24-48 hours depending on the weather conditions.


Apply the sealant using a roller or a sprayer, depending on the product recommendations and the area’s size. Work in small sections to ensure even coverage, and always follow the manufacturer’s directions regarding application and necessary coats. Avoid applying sealant in direct sunlight or during the hottest part of the day to prevent it from drying too quickly, which can lead to uneven coverage.

Curing Time

After application, give the sealant time to cure. The curing time can vary based on the type of sealant used and the weather conditions but typically ranges from 24 to 72 hours. During this time, keep the sealed area free from water and foot traffic.


Once sealed, your natural stone will be easier to maintain. Regular sweeping and occasional washing with appropriate cleaners will help your stone look its best. We recommend re-sealing natural stone every two to three years, or more frequently if it’s in a high-traffic area or exposed to harsh conditions.

By taking the time to properly seal your natural stone this spring, you’re ensuring that your outdoor spaces remain beautiful and functional for many seasons to come. If you have any questions about sealing your natural stone or would like professional assistance, the team at Roman Building Landscapes is just a call away. Let’s ensure your home and garden are ready to welcome the beautiful Welsh spring!