Best Waterproof Sealants for Brick Surfaces for Outdoor Durability
Protect brickwork and masonry from moisture, water intrusion, and air leaks with high-performance sealants. This guide highlights five top options designed to cure clear or flexible on brick, concrete, and outdoor surfaces. Each product section provides a quick overview of features, ideal applications, and performance notes to help you choose the right sealant for bricks, patios, and exterior walls.
| Product | Brand | Ideal Use |
|---|---|---|
| Gorilla Waterproof Patch & Seal Spray | GORILLA | Small gaps, cracks, and leaks on bricks and masonry |
| MasonryDefender All Purpose Brick Stone & Concrete Sealer | MasonryDefender | Outdoor masonry surfaces; penetrating and protective |
| Gorilla Waterproof Caulk & Seal Silicone Sealant | GORILLA | Indoor/outdoor caulking for windows, doors, kitchens, baths |
| GE Advanced Silicone Caulk for Window & Door | GE | Weatherproof seal around openings; long-term flexibility |
| LUVBOATE Liquid Waterproof Sealant | LUVBOATE | Clear, long-lasting outdoor/indoor waterproofing |
Gorilla Waterproof Patch & Seal Spray
Gorilla Waterproof Patch & Seal provides a flexible rubberized coating that seals out water, air, and moisture to stop leaks on brick surfaces. The spray pattern supports an even, controlled application, ideal for small gaps, cracks, and joints in exterior brickwork. Once cured, the rubberized coating offers temperature and UV resistance, delivering a clear, durable repair that remains flexible over time. This option is well-suited for quick, spray-on sealing of brick-and-mortar leaks where a neat finish is prioritized.
Key considerations: easy application, fast curing, and compatibility with outdoor brick surfaces. It is best for localized leaks and surface-level sealing, rather than heavy-duty, long-term penetration for large porous bricks.
MasonryDefender All Purpose Brick Stone & Concrete Sealer
This penetrating silane/siloxane-based sealer provides deep protection for outdoor brick, stone, and concrete. It leaves a clear, watertight barrier that preserves the natural appearance while preventing moisture intrusion. Suitable for patios, brick walls, and other exterior masonry, it offers broad coverage (1 gallon typically covers 90-150 sq. ft.) and helps extend the life of masonry by reducing water damage and efflorescence. It emphasizes durability and minimal visual impact on the surface.
Key considerations: deep penetration and broad surface compatibility. Best for outdoor masonry projects where long-term moisture protection is needed without altering the look of brick.
Gorilla Waterproof Caulk & Seal Silicone Sealant
This 100% silicone caulk delivers a reliable waterproof seal for gaps around bricks, windows, doors, kitchens, bathrooms, and outdoor joints. It cures to a flexible, weather-resistant seal that can withstand exposure to water relatively quickly, enabling faster readiness for moisture-prone environments. The product’s versatility makes it suitable for both interior and exterior brickwork where a durable, durable caulk is required.
Key considerations: fast curing for water exposure, strong adhesion, and widespread indoor/outdoor use. Ideal for sealing around brick openings and joints that experience routine moisture.
GE Advanced Silicone Caulk for Window & Door
GE Advanced Silicone Caulk offers a 100% waterproof silicone seal with enhanced adhesion and flexibility. It’s designed for windows and doors but also works well on brick joints that require a stable, long-lasting seal against weather. The product emphasizes resistance to mold and mildew, reducing maintenance needs on exterior brickwork exposed to humidity and temperature swings. It’s a good option when a durable, weatherproof seal with extended lifespan is needed.
Key considerations: strong adhesion, mold resistance, and long-term flexibility. Particularly effective around openings and areas prone to movement and moisture exposure.
LUVBOATE Liquid Waterproof Sealant
LUVBOATE offers a clear, water-based sealant designed to form a dense waterproof membrane. It’s suitable for indoor and outdoor brick surfaces and can seal leaks by penetrating gaps and cracks. The product notes UV resistance and a long-lasting film that maintains surface aesthetics while preventing moisture intrusion. It’s a versatile option for those seeking a transparent, easy-to-apply solution with long-lasting performance on brick walls and other outdoor masonry.
Key considerations: water-based formulation for easy cleanup, UV stability, and clear finish. Best for visible brick surfaces where a nearly invisible seal is preferred.
Buying Guide: Key Purchase Considerations
Project type and surface: Outdoor brick and masonry require sealants with UV resistance, weatherproofing, and durable adhesion. For interior brick or planning to seal around openings, flexible silicone caulks offer longer-term movement accommodation.
Penetration vs. surface seal: Penetrating sealers protect from within the material and help maintain the natural brick appearance, while surface coatings create a visible barrier that can be clear or color-matched. Choose based on whether you want to preserve texture or seal cracks on the face of the brick.
Cure time and moisture exposure: Quick-curing formulations are advantageous for damp climates or areas that experience frequent moisture. Consider whether you need a fast dry time to resume use of outdoor spaces, like patios or paths.
Flexibility and durability: Silicone-based products typically offer lasting elasticity and resistance to cracking with temperature changes. If brick joints experience movement, a flexible sealant will reduce future cracking.
Ease of application: Spray sealants are convenient for small, hard-to-reach areas, while cartridges and tubes are better for precise joints and edges. Surface preparation—cleaning, drying, and sometimes priming—improves adhesion and longevity.