10 Best Composite Deck Stains 2025 in the United States

Thompson’s WaterSeal Multi-Surface Waterproofer Stain in Clear is designed to protect and enhance the appearance of various exterior surfaces, including wood, concrete, and brick. One of its notable strengths is the waterproofing capability, which ensures that the surfaces stay protected from water damage. The clear stain allows the natural texture of the material to show through, while providing a smooth finish that maintains the surface's original look.

UV protection is another strong point, as the advanced polymers in the stain resist fading and UV damage, keeping the surfaces looking fresh year-round. This product also boasts mildew resistance, which is crucial for maintaining the integrity and cleanliness of outdoor areas exposed to moisture. Application is straightforward, requiring thorough surface cleaning for optimal results, which simplifies the maintenance process.

Since it provides a clear finish, it does not add color to the surface; it merely enhances the existing color, which may not suit users looking for a more dramatic color change. Another aspect worth noting is the environmental impact; being water-based, it is less harmful to the environment compared to solvent-based stains. With a coverage of 100-125 square feet per quart and easy-to-follow application guidelines, Thompson’s WaterSeal is a practical choice for protecting and preserving exterior surfaces.

The DEFY Composite Deck Sealer is a premium waterproof sealant designed for weathered composite wood. One of its major strengths is its transparency, which allows the natural beauty of the wood to shine through while providing protection. The sealer offers effective UV protection, helping to prevent the wood from fading under sunlight. Additionally, it is resistant to mildew, making it a good choice for damp or humid environments.

The product's durability ensures long-lasting protection, reducing the need for frequent reapplications, which is a significant advantage for users looking for a low-maintenance option. Its ease of application is another benefit, as it comes in a user-friendly formula that can be applied with basic tools, making it accessible even to those with little DIY experience. However, one potential drawback is its environmental impact. As with many sealants, users should be aware of the chemical components and their potential effects.

While the product is not discontinued, it has been available since 2013, so users might want to check for any newer formulas or updated versions. The DEFY Composite Deck Sealer is a solid choice for those seeking a reliable, easy-to-apply solution to protect and enhance the appearance of their composite decking.

Thompson’s WaterSeal Semi-Transparent Waterproofing Wood Stain and Sealer in Chestnut Brown is designed to protect and enhance outdoor wood surfaces. The semi-transparent finish allows the wood texture to show while hiding the grain, providing a subtle, natural look. One of its main strengths is its waterproofing ability, which helps prevent water damage and prolongs the life of your deck or fence.

Additionally, it offers good UV protection with its fade-resistant polymers, ensuring the color stays vibrant over time. The stain also exceeds industry standards for waterproofing, giving users confidence in its protective qualities. Applying this stain is straightforward, even on damp wood, making it user-friendly for those refinishing existing structures or working on new projects.

Given its ease of application and protective features, this product is well-suited for homeowners looking to maintain or improve the appearance and durability of their outdoor wood spaces.