Best Water Seal for Bricks: Top Exterior Brick Sealers
Looking to protect brick surfaces from water damage, freeze-thaw cycles, and stains? This guide highlights five effective brick sealers that resist moisture while preserving a natural brick look. The best-fit choices vary by project type, from chimneys and walls to outdoor patios and driveways. Read on to find solutions tailored for indoor/outdoor use, permanence, and finish preference.
A quick summary of the selected products:
| Product | Brand | Best For | Finish |
|---|---|---|---|
| MasonryDefender Chimney Brick Sealer | MasonryDefender | Vertical masonry surfaces like chimneys | Clear, breathable sealant |
| Rainguard Water Sealers Brick Sealer (5 gal) | Rain Guard Water Sealers | All brick/mortar surfaces indoors or outdoors | Natural finish, penetrating |
| Rainguard Brick Sealer (1 gal) | Rain Guard Water Sealers | Brick and mortar protection | Natural finish, filmless |
| 1 Gallon Bricks & Exterior Surfaces Sealer | OAIEGSD | Driveways, patios, bricks, pavers | Natural look, penetrating |
| Thompson’s WaterSeal Multi-Surface Waterproofer Stain (Clear) | Thompson’s | Concrete, brick, exterior wood | Clear stain with protection |
Note: This guide focuses on water sealing for brick and masonry exposure. Each product description below cites key features to help you compare ease of use, breathability, finish, and suitability for different brick surfaces.
MasonryDefender Chimney Brick Sealer
Best for: Chimneys and vertical masonry where long-term durability is essential. This cement-ready, water-based siloxane sealer forms a permanent bond, allowing trapped moisture to escape. It does not alter surface color, preserving the natural look of brick. Use this if you need a breathable, non-film-forming seal that resists weather without changing appearance.
Why selected: The product emphasizes breathability and compatibility with chimney masonry, reducing the risk of trapped moisture that could cause freeze/thaw damage.
Caution: Some surfaces may require proper cleaning before application to ensure maximum penetration and adhesion.
Rainguard Water Sealers Brick Sealer (5 Gal)
Best for: Large brick surfaces indoors or outdoors where a long-lasting, penetrating seal is needed. The product creates an invisible barrier that resists wind-driven rain, stains, and moisture while preserving a natural finish.
Why selected: Its filmless, penetrating formula protects against freeze-thaw cycles and efflorescence without altering color, making it ideal for extensive brickwork like facades or walls.
Caution: The 5-gallon size is best for larger projects; for small jobs, consider the 1-gallon option to minimize waste.
Rainguard Brick Sealer (1 Gal)
Best for: Indoor and outdoor brick or mortar surfaces where a natural finish is preferred. This siloxane-based sealer penetrates unpainted brick to prevent cracks from moisture and freeze-thaw cycles.
Why selected: It offers a balanced approach—penetration depth with a no-gloss finish—making it suitable for surfaces where the natural texture and color should remain visible.
Caution: Do not over-apply; follow reapplication intervals to maintain protection against weathering.
1 Gallon Bricks & Exterior Surfaces Sealer
Best for: Driveways, patios, pavers, and exterior brick surfaces needing water resistance and color enhancement. The penetrating formula is designed to resist water absorption and preserve surface beauty.
Why selected: It emphasizes all-weather performance and surface protection without peeling, making it suitable for mixed outdoor stone and brick installations.
Caution: VOC considerations may apply; verify ventilation and reapplication needs for your climate.
Thompson’s WaterSeal Multi-Surface Stain (Clear)
Best for: Concrete, brick, and exterior wood where a clear stain finish is desired while providing waterproofing. The clear stain hides grain yet preserves texture and provides UV fade resistance.
Why selected: This option is ideal when you want to protect brick surfaces while maintaining a natural appearance and color depth without adding a visible pigment.
Caution: Clear finishes may still slightly alter color perception; test on a small area before wide coverage.
Thompson’s Clear Wood Sealer (1 Gal)
Best for: Wood-friendly brick or masonry surfaces where water protection is needed without a tinted finish. This sealer dries clear, helping preserve natural colors while adding a protective layer.
Why selected: It offers an alternative for projects where brick surfaces neighbor wood elements and a clear finish is preferred to avoid color shifts.
Caution: Solvent-based formulations may require adequate ventilation during application and curing.
Buying Guide: Key Considerations for Brick Sealing
- Breathability vs. film-forming: Breathable sealers let trapped moisture escape, reducing the risk of cracks, while film-forming sealers create a protective layer but may obscure textures over time.
- Finish preference: Natural look versus subtle sheen. For a no-gloss, natural appearance, choose penetrating or siloxane sealants; for slight enhancement, look at clear stains.
- Surface compatibility: Some products are designed specifically for chimneys or vertical surfaces; others suit patios, drives, or interior brick walls. Match the product to the surface type.
- Penetration depth and durability: Deeper penetration can offer longer protection against moisture and freeze-thaw cycles but may require more preparation tasks before application.
- Water repellency vs. stain resistance: Decide whether you need a water-repellent barrier, stain resistance, or both. Some products emphasize efflorescence control in addition to moisture protection.
- Maintenance interval: Reapplication schedules depend on climate, rainfall, and sun exposure. Plan periodic inspection and timely reapplication for ongoing protection.
- Finish color impact: Clear versus tinted finishes affect the visible look of brick. If you want to preserve natural color, choose clear sealers or breathable siloxane penetrants.
Frequently Asked Questions
- What is the best sealer for brick that looks natural?
– A penetrating siloxane or breathable sealant that dries clear typically preserves the natural brick appearance without adding gloss. - Do brick sealers stop efflorescence?
– Some sealers help reduce moisture movement and efflorescence, but results vary by product and surface conditions. - Can I seal a chimney brick surface?
– Yes, select a breathable, non-film-forming sealant designed for masonry to accommodate moisture movement and prevent cracking. - Should I seal interior brick surfaces?
– Sealing interior brick is less common but can be used to control moisture and stains in damp areas. Choose a product formulated for interior use. - How often should brick sealing be reapplied?
– Reapplication intervals depend on climate, UV exposure, and surface wear. Regular inspections help determine timing. - Is a clear sealer better than a tinted stain?
– Clear sealers protect moisture without changing color; tinted stains provide color enhancement but reduce the brick’s natural look.