Best Brick Sealer Options for Exterior and Interior Walls
Brick walls face moisture, staining, and the wear of time whether indoors or outdoors. The right sealer protects color, reduces dirt intrusion, and makes cleaning easier. This guide highlights five top brick sealers, comparing penetration, breathability, and durability to help you choose the best option for your project.
Summary of selected products
| Product | Brand | Type / Finish | Key Benefit |
|---|---|---|---|
| MasonryDefender Brick Sealer | MasonryDefender | Water-based Acrylic; Satin finish | Interior & exterior protection; reduces brick dust; easy to clean |
| MasonryDefender Chimney Brick Sealer | MasonryDefender | Water-based Siloxane; Breathable | Chimneys and vertical masonry; prevents leaks; preserves surface |
| Sure Klean Weather Seal PD | Prosoco | Siloxane PD; penetrating | Deep protection; long service life; resists water intrusion |
| LastiSeal Brick & Masonry Sealer | RadonSeal | Water-based; 15-year life | Low odor; versatile for interior/exterior; easy spray/roll/brush |
| Rain Guard SP-3001 Brick Sealer | Rain Guard | Silane/Siloxane concentrate | Concentrated, long-lasting; invisible finish |
MasonryDefender Brick Sealer – Satin Finish
This clear water-based acrylic sealer delivers protection for both interior and exterior brick walls. It forms a moisture-repellent layer that helps reduce brick dust and makes surfaces easier to clean. The satin sheen preserves the natural brick color while adding a subtle finish that enhances brickwork without masking texture. Apply in multiple coats to adjust the level of shine for high-traffic areas or decorative brick. Suitable for masonry surfaces, it creates a washable surface that resists dirt buildup on walls, chimneys, and other vertical surfaces.
Designed to be user-friendly, the sealer penetrates the surface without forming a heavy film. It is appropriate for basements, living rooms with brick accents, or exterior facades where mildew resistance and washability matter. For best results, prepare the brick by removing loose dust and allowing the surface to dry before application. Reapply as needed to maintain the satin finish and protective barrier over time.
MasonryDefender Chimney Brick Sealer
This chimney-focused sealer uses a breathable siloxane formula that bonds with exterior masonry to protect against water intrusion. It allows trapped moisture to escape, reducing the risk of freeze/thaw damage while maintaining the surface color. The non-film-forming sealant works well on chimneys, brick walls, and other vertical masonry like stone or stucco. It provides long-lasting protection without creating a glossy or altered appearance, preserving the texture and finish of the masonry while repelling water and dirt.
Because it breathes, this sealer is ideal for outdoor structures exposed to wind-driven rain and temperature swings. Surface preparation remains important: clean loose debris and ensure the surface is dry before application. Reapplication intervals depend on climate and exposure, but the breathable nature helps maintain surface integrity over time without compounding wear on the brick.
PROSOCO Sure Klean Weather Seal PD
Sure Klean Weather Seal Siloxane PD penetrates deeply to protect brick, concrete, masonry, stucco, and manufactured stone. By forming a hydrophobic barrier below the surface, it significantly reduces water absorption, helping the masonry resist cracking, staining, and other water-related damage. Its performance is designed to last more than a decade, providing durable protection for both exterior and interior projects where long-term waterproofing matters.
The sealer is formulated to preserve the natural color and texture of the substrate, avoiding color changes or surface gloss. Proper surface preparation—cleaning and drying the brick prior to application—ensures optimal penetration. Depending on climate and exposure, reapplication intervals will vary, but the long service life supports infrequent maintenance while maintaining masonry integrity.
LastiSeal Brick & Masonry Sealer
LastiSeal Brick & Masonry Sealer offers a long-lasting, water-based solution with a 15-year service life. It provides reliable waterproofing for brick, concrete, stone, and other masonry surfaces on both interior and exterior projects. The formula is low-odor, non-toxic, non-flammable, and easy to apply by spray, roll, or brush, making it suitable for DIYers and professionals alike. The sealer penetrates to form a durable barrier that helps protect against moisture-related damage while preserving the natural look and texture of brick and stone surfaces.
Its extended service life and user-friendly application make it a popular choice for exterior walls, chimney surrounds, walkways, and patios where long-term protection is a priority. Proper application—clean, dry surfaces and even coating—helps maximize penetration and the overall protective benefits. For large masonry zones, the product’s safety profile and straightforward method support efficient maintenance routines over time.
Rain Guard SP-3001 Brick Sealer Concentrate
Rain Guard SP-3001 is a concentrated brick sealer that makes 1 gallon of protection from a single quart concentrate. It delivers deep, penetrating water repellency without altering the surface texture or color, leaving an invisible, natural finish. The formula includes Micro-Lok technology to ensure robust absorption and a long-lasting barrier against weathering, salt, UV light, and dirt. Suitable for all brick surfaces indoors or outdoors, it provides cost-effective, scalable protection for walls, driveways, chimneys, sidewalks, and patios.
The concentrated nature helps reduce waste and extend coverage, especially on large brick installations. It’s designed to work on vertical or horizontal brick surfaces, providing a uniform finish across complex masonry layouts. Application requires proper surface prep and timing for curing, but the result is a durable, non-obtrusive seal that preserves the brick’s natural appearance while extending its life in challenging climates.
Buying Guide: Key Considerations When Choosing a Brick Sealer
Choosing the right brick sealer depends on surface type, climate, and how you plan to use the space. Consider these factors to compare options effectively.
- Penetration vs. film formation: Penetrating siloxane/silane sealers protect without changing color or texture, while film-forming acrylic sealers can add a subtle sheen. For historic or textured brick, penetrating options often preserve the look best.
- Breathability: Exterior vertical surfaces like chimneys benefit from breathable sealers that allow trapped moisture to escape, preventing structural damage from freeze/thaw cycles.
- Surface appearance: If you want a satin or matte finish, choose sealers described as satin or clear with no noticeable gloss. If a slight sheen is desired, a satin finish can provide that without altering color.
- Protection duration: Look for service life claims (e.g., 10+ years or 15-year warranties). Long-lasting formulas reduce maintenance but may require more thorough preparation.
- Indoor vs outdoor use: Some products are aimed at interior walls where low odor and low VOCs matter, while others are designed for harsh outdoor exposure and weather resistance.
- Application and curing: Consider whether the sealer is spray, roller, or brush-friendly, and whether you need multiple coats. Drying and cure times affect project timelines.
- Safety and compatibility: Check for low odor, non-toxicity, and compatibility with brick, masonry, stone, or stucco. Some sealers are better suited for chimneys or vertical surfaces.
- Concentrates vs ready-to-use: Concentrates save cost for large areas but require mixing and proper measurement, while ready-to-use formulas offer convenience for quick projects.
When evaluating, compare the five sealers above on these dimensions: intended use (interior vs exterior), expected service life, breathability, appearance after sealing, and ease of application. For historic or highly textured brick, prioritize breathable, color-preserving penetrating sealers. For busy exterior walls exposed to harsh weather, prioritize long-lasting, durable protection even if a mild sheen appears. Always follow manufacturer prep and curing instructions for best results.