Brick surfaces face moisture, efflorescence, and dust, especially in areas exposed to the weather. A high-quality brick sealer can reduce infiltration, prevent staining, and make routine cleaning easier. The best option depends on whether the brick is indoors, outdoors, or on a chimney or fireplace.
This guide highlights five top sealer choices that balance penetration, breathability, and durability for American homes. The summary table below compares core attributes to help you pick the right sealer for your brick project.
| Product | Brand | Type | Notable Benefit |
|---|---|---|---|
| MasonryDefender Brick Sealer | MasonryDefender | Water-based Acrylic | Satin Finish; Easy Cleaning |
| MasonryDefender Chimney Seal | MasonryDefender | Siloxane Waterproofer | Breathable; No Color Change |
| PROSOCO Sure Klean Weather Seal | Prosoco | Siloxane Sealer | Long-Lasting Protection |
| LastiSeal Brick & Masonry | RadonSeal | Water-Based | 15-Year Service Life |
| Armor SX5000 WB | Foundation Armor | Silane-Siloxane | Color-Stable; Strong Beading |
MasonryDefender Brick Sealer – Interior/Exterior
The MasonryDefender Interior/Exterior Brick Sealer provides water-repellent protection for brick walls both inside and outside. This clear acrylic sealer creates a satin sheen that preserves the brick’s natural color while adding subtle luster. It forms a washable surface, making routine cleaning easier and helping prevent dirt buildup on both indoor and outdoor masonry surfaces. The product is designed to resist moisture, cracking, and flaking, reducing deterioration over time. For a higher sheen, apply additional coats as needed to suit the look you want.
- Interior and exterior wall protection
- Clear satin sheen preserves natural color
- Washable surface for easier cleaning
MasonryDefender Chimney Brick Sealer
The MasonryDefender Chimney Brick Sealer is a clear siloxane waterproofer designed for exterior vertical masonry, including chimneys, brick walls, and related surfaces. It forms a breathable, durable protective layer that prevents water intrusion while allowing trapped moisture to escape, helping to reduce freeze-thaw damage. Being breathable is crucial for exterior masonry, where trapped moisture can cause flaking or cracking if blocked. The sealant is formulated to remain color-stable and non-film forming, maintaining the brick’s natural appearance even after multiple applications.
- Permanent bond with masonry
- Breathable, non-film forming
- Protects against leaks and water intrusion
PROSOCO Sure Klean Weather Seal Siloxane PD
PROSOCO Sure Klean Weather Seal Siloxane PD offers deep penetration for long-lasting protection across brick, concrete, masonry, stucco, and manufactured stone. This siloxane-based sealer helps masonry resist cracking, spalling, staining, and other water-related damage by creating a durable, hydrophobic barrier. It is designed to perform in a variety of climates and is expected to provide service life exceeding ten years in many applications, making it a strong choice for exterior walls where long-term durability matters most.
- Deep penetration on multiple substrates
- Resists cracking, spalling, staining
- Service life often exceeds 10 years
LastiSeal Brick & Masonry Sealer
LastiSeal Brick & Masonry Sealer is an all-purpose, water-based sealer intended for interior and exterior use on brick, concrete, and masonry surfaces. It emphasizes a long service life, backed by a 15-year waterproofing warranty. The formula is non-toxic and low-odor, making it suitable for indoor applications where odor sensitivity is a concern. Application is straightforward via spray, roll, or brush, enabling flexibility for DIYers and professionals alike. The sealer aims to protect against water intrusion while preserving the natural look of the substrate.
- 15-year service life warranty
- Water-based, low odor, non-toxic
- Easy spray, roll, or brush application
Armor SX5000 WB Silane-Siloxane Sealer
The Armor SX5000 WB Sealer is a professional-grade, water-based silane-siloxane formula designed for concrete, brick, pavers, stone, and other masonry. It reduces water absorption by up to 95% without changing the look or color of the substrate, preserving the natural texture. This makes it suitable for use on external walls, driveways, and other masonry surfaces where a clear, breathable barrier is desired. The product supports durable protection against moisture ingress while maintaining the surface’s original aesthetic.
- Professional-grade water-based sealant
- Drastically reduces water absorption
- Color- and appearance-preserving
Buying Guide
Key purchase considerations
Choosing the right brick sealer involves balancing protection, appearance, and maintenance needs. Penetrating sealers (silane/siloxane) guard against water while remaining breathable, making them ideal for exterior brick and chimneys. Film-forming sealers (certain acrylics) can add a satin sheen and are often favored for indoor brick where a subtle finish is desired. Consider the surface type (brick, concrete, stone), whether the project is interior or exterior, and the level of moisture exposure.
Breathability and surface appearance
Breathability matters when moisture must escape from the substrate. Siloxane-based sealers typically permit vapor transmission, reducing the risk of moisture-related damage. Acrylic sealers may alter look slightly with a satin or glossy finish. If color neutrality is essential, select a non-film-forming product that preserves the brick’s natural hue. For outdoor projects, prioritize breathable formulations to prevent weather-induced deterioration.
Coverage, durability, and maintenance
Coverage rates vary by product and surface porosity; plan for gallons per square foot and potential reapplication timelines. Durable sealers may offer multi-year or decade-long protection, especially on exterior masonry. Maintenance considerations include whether the sealer creates a washable surface or requires periodic reapplication after weather events. If long-term protection with minimal upkeep is the goal, prioritize deeper penetration and robust weatherproofing features.
Application method and safety
Most brick sealers can be applied with a roller, brush, or sprayer. Choose a formula that aligns with your project scale and tool preference. Read safety data sheets for ventilation needs and surface preparation steps, such as cleaning and drying times. Water-based products typically have lower odor and easier cleanup, which can matter for indoor use.
Surface compatibility and warranties
Confirm compatibility with your brick type, mortar joints, and any existing coatings. Some products offer extended warranties and service life expectations (ranging from 10 to 15 years in many cases). A longer warranty can indicate durable performance, but ensure the sealant aligns with your climate and maintenance capabilities.
Quick comparison at a glance
- Interior vs exterior suitability
- Breathability vs surface film formation
- Penetration depth and long-term durability
- Color stability and sheen options
- Application flexibility and cleanup