Answering the question “what’s the best water seal for bricks?” requires selecting products that protect brick surfaces without altering their natural appearance. This guide presents five top brick and masonry sealers, chosen for durability, breathability, and clear finishes. Each option is suited to different needs—from chimneys to patios and indoor brick features. Whether you want a penetrating silane/siloxane seal or a film-forming waterproof coating, you’ll find practical, comparison-friendly details to help you decide.
Summary table of selected products (for quick reference):
| Product | Brand | Type | Best For |
|---|---|---|---|
| Thompson’s WaterSeal Multi-Surface Waterproof Stain, Clear | Thompson’s | Outdoor brick and exterior surfaces needing a clear finish | |
| MasonryDefender Chimney Brick Sealer | MasonryDefender | Vertical masonry like chimneys | |
| Rainguard Water Sealers Brick Sealer | Rain Guard Water Sealers | All brick and mortar surfaces, natural finish | |
| Armor SX5000 WB | Foundation Armor | Concrete, brick, pavers with a natural look | |
| MasonryDefender All Purpose Brick Stone & Concrete Sealer | MasonryDefender | Outdoor masonry like brick, stone, and concrete |
Thompson’s WaterSeal Multi-Surface Waterproof Stain
Best for: Outdoor brick or concrete surfaces that benefit from a clear finish while preserving texture. This waterproofing stain deepens color slightly but remains clear enough to reveal brick’s natural character. The product’s fade-resistant finish helps protect against UV damage, making it suitable for year-round exterior use.
Why selected: The clear stain combines waterproof protection with a finish that hides grain but keeps surface texture visible. It’s a practical option when you want a low-profile look while blocking water intrusion.
Limitations: As a stain and sealer, it will alter color slightly; test on a hidden area to confirm appearance before broader application.
MasonryDefender Chimney Brick Sealer
Best for: Chimneys and vertical masonry that must withstand freeze/thaw cycles. This breathable siloxane-based sealer forms a permanent bond with masonry, allowing trapped moisture to escape while preventing water intrusion.
Why selected: Its breathable, non-film-forming nature protects interior masonry from moisture without changing color, making it ideal for preserving the appearance of brick surfaces on exterior chimneys.
Caution: Over-application can lead to a slightly darker look on very porous bricks; follow coverage guidelines to maintain a natural appearance.
Rainguard Water Sealers Brick Sealer
Best for: Brick and mortar surfaces requiring an invisible, hydrophobic barrier. It penetrates without changing surface color, providing long-lasting protection against wind-driven rain and moisture.
Why selected: The invisible, filmless formula is ideal where appearance matters, such as exterior brick walls or decorative brick features that should keep a natural look.
Limitation: Penetrating sealers rely on proper surface prep; moisture or contaminants in the brick can affect penetration depth and performance.
Armor SX5000 WB For Brick And Concrete
Best for: Surfaces needing strong water repellency without altering look or texture. This professional-grade sealer reduces water absorption by up to 95% and preserves the original look.
Why selected: The strong performance and color-neutral finish make it a solid choice for projects where preserving the brick’s natural appearance is important, such as exterior walls and pathways.
Limitation: Large-volume options may be most economical for bigger projects, but consider application equipment and ventilation during use.
MasonryDefender All Purpose Brick Stone & Concrete Sealer
Best for: Outdoor masonry including brick, stone, and concrete with a need for deep penetration and clear protection. It stabilizes joints and helps prevent moisture-related deterioration over time.
Why selected: A penetrating silane/siloxane sealer that guards multiple masonry materials, offering a uniform clear finish without yellowing or gloss changes.
Limitation: Some surfaces with unusual porosity may require additional coats for optimal protection; follow surface prep guidelines for best results.
Buying Guide: Key Considerations For Brick Seals
What type of sealer should you choose? Decide between penetrating silane/siloxane sealers and film-forming sealers. Penetrating sealers protect from the inside while preserving natural appearance; film-forming sealers create a surface coating and may alter color or finish.
How breathable should the product be? Breathable sealers allow trapped moisture to escape, reducing the risk of freeze/thaw damage in exterior brick surfaces. For chimneys or high-moisture areas, breathable options are typically preferable.
What is the surface type and exposure? Exterior walls, chimneys, patios, and decorative brick features have different demands. Choose products labeled for brick, masonry, or exterior surfaces to ensure compatibility and performance.
Color and finish: If you want a natural look, pick clear or transparent sealers. If you’re open to a slight color enhancement, a tinted or clear sealant can improve appearance while protecting the surface.
Application and coverage: Check approximate coverage per gallon and whether multiple coats are recommended. Larger areas benefit from products designed for easy application, such as sprayable or brush-on formulas.
Durability and maintenance: Consider UV resistance, long-term protection, and maintenance intervals. Some sealers offer UV fade resistance and lasting protection against wind-driven rain.
FAQ
What is the best sealer for outdoor brick? A penetrating silane/siloxane sealer that is breathable is often best for outdoor brick, balancing protection with appearance.
Do penetrating sealers change brick color? Most penetrating sealers do not significantly change color, but some may darken very porous bricks slightly.
How often should brick be resealed? It depends on the product and exposure, but many sealers require reapplication every 3–5 years for outdoor masonry in harsh climates.
Can I seal brick indoors? Yes, but choose low-odor, water-based options suitable for indoor use and ensure proper ventilation during application.
Is a clear finish always best? For preserving natural brick appearance, a clear finish is often preferred. If you want to enhance color slightly, consider a tinted but still transparent option.