Best Sealer for Brick: Top Picks to Protect and Preserve Masonry
Brick surfaces benefit from sealers that protect against moisture while preserving color and texture. The following selections are among the best-rated sealers for interior and exterior brick, chimneys, and other masonry. Read on to compare their strengths, application notes, and how they fit different brick projects.
| Product | Brand | Type | Main Benefit | |
|---|---|---|---|---|
| MasonryDefender Interior/Exterior Brick Sealer | MasonryDefender | Acrylic Water-Based Sealer | Clear satin sheen; reduces brick dust | Indoor/outdoor brick walls |
| MasonryDefender Chimney Brick Sealer | MasonryDefender | Siloxane Waterproofer | Breathable, long-lasting protection | Exterior chimneys and vertical masonry |
| Sure Klean Weather Seal Siloxane PD | Prosoco | Siloxane Water Repellent | Deep penetration, long service life | Brick, concrete, stucco and stone |
| LastiSeal Brick & Masonry Sealer | RadonSeal | Water-based Sealer | 15-year service life | Interior & exterior brick, stone, concrete |
| Rain Guard Brick Sealer Concentrate SP-3001 | Rain Guard Water Sealers | Silane/Siloxane Concentrate | Deep penetrating, invisible finish | All brick surfaces |
The selections above emphasize penetrating protection, breathability, and color preservation, suitable for a range of brick projects from interior walls to outdoor chimneys. Each option brings distinct advantages, whether you need a clear satin look, long-term service life, or a ready-to-mix concentrate for cost efficiency.
MasonryDefender Interior/Exterior Brick Sealer
Type: Clear satin acrylic sealer, water-based. Protects interior and exterior brick walls from moisture, cracking, and flaking while preserving the brick’s natural color. The satin sheen adds a subtle finish and makes walls easier to clean by creating a washable surface. Suitable for high-traffic walls and areas exposed to humidity or temperature fluctuations.
MasonryDefender Chimney Brick Sealer
Type: Siloxane waterproofer; breathable, non-film-forming sealant for exterior masonry. Bonds with chimney masonry to prevent water intrusion while allowing trapped moisture to escape. Ideal for vertical surfaces like chimneys and other exterior brickwork without altering surface color.
PROSOCO Sure Klean Weather Seal Siloxane PD
Type: Siloxane penetrating sealer. Provides deep protection for vertical or horizontal brick, as well as concrete, masonry, stucco, and manufactured stone. Expected service life exceeds 10 years, reducing water intrusion while maintaining the natural appearance of the substrate.
LastiSeal Brick & Masonry Sealer
Type: Water-based sealer with a 15-year service life warranty. Non-toxic, non-flammable, with easy application by spray, roll, or brush. Suitable for interior and exterior brick, concrete, and masonry, providing long-lasting waterproofing without odor.
Rain Guard SP-3001 Brick Sealer Concentrate
Type: Concentrated silane/siloxane sealer. Makes 1 gallon, designed for deep penetrating waterproofing with an invisible, non-yellowing finish. Works for all brick surfaces and provides durable resistance to weathering, salt, and UV exposure without altering texture or appearance.
Buying Guide: Key Considerations For Choosing A Brick Sealer
Purpose and location: Interior walls may benefit from sealers that reduce brick dust and add a gentle sheen, while exterior surfaces require breathable, durable protection against weathering. Chimneys demand high breathability to avoid moisture entrapment and freeze/thaw damage.
Penetration vs film-forming: Penetrating siloxane/silane sealers protect from the inside out and preserve texture and color. Film-forming acrylics or sealers can add a surface gloss and are easier to wipe clean but may alter appearance over time.
Breathability: Breathable sealers prevent moisture buildup behind the brick that can cause spalling or cracking. This is especially important for chimneys, which experience temperature shifts and moisture exposure.
Durability and service life: Look for sealers with long expected service life, such as 10+ years for penetrative sealers. Consider warranty terms and whether the product is designed for interior, exterior, or both.
Application and maintenance: Evaluate ease of application (brush, roller, or spray), dry time, re-application frequency, and whether multiple coats are needed to achieve the desired finish or protection level.
Color and finish: Decide between clear, satin, or glossy finishes. For brick walls where color preservation is important, a clear sealer that enhances natural tones without yellowing is preferable.
Safety and compatibility: Check for low odor, non-toxic formulations when indoor use is planned. Verify compatibility with existing coatings or surface treatments and ensure proper ventilation during application.
Cost and coverage: Compare coverage per gallon and whether concentrates offer cost savings for larger projects. Consider mixing ratios, total square footage, and waste reduction when planning a sealing job.
Regulatory and environmental concerns: Prefer sealers with low volatile organic compounds (VOCs) and environmentally responsible formulations when indoor air quality is a priority.