Protecting brick surfaces from rain, moisture, and freeze-thaw damage is essential for long-lasting durability. The following selections focus on penetrating, breathable sealers that preserve brick’s natural appearance while offering strong water repellency. This guide highlights five top options and compares their features to help homeowners, contractors, and DIY enthusiasts choose the right brick sealer for indoor and outdoor applications.
Summary of chosen products
| Product | Finish | Volume | Best For |
|---|---|---|---|
| Rain Guard Water Sealers Brick Sealer (Natural Finish) — 1 Gal | Natural | 1 Gallon | Outdoor brick, mortar, multiple surfaces |
| Rain Guard Water Sealers Brick Sealer (Natural Finish) — 5 Gal | Natural | 5 Gallons | Larger areas, commercial or multi-area projects |
| Thompson’s WaterSeal Multi-Surface Stain (Clear) — 1 Gallon | Clear Stain | 1 Gallon | Brick, concrete, exterior wood |
| MasonryDefender Brick Sealer Satin Sheen — 1 Gallon | Satin | 1 Gallon | Interior and exterior brick walls |
| MasonryDefender Chimney Brick Sealer — 1 Gallon | Breathable Clear | 1 Gallon | Chimneys and vertical masonry |
Rain Guard Water Sealers Brick Sealer — Natural Finish, 1 Gallon
Rain Guard Water Sealers’ brick sealer creates an invisible, filmless barrier that repels wind-driven rain, water, and other contaminants. It penetrates unpainted brick surfaces to resist cracks from freeze-thaw cycles while preserving a natural, no-gloss finish. The formulation is designed for both indoor and outdoor use, making it suitable for brick floors, chimneys, walkways, walls, and garden structures without altering the brick’s appearance.
Key features include a hydrophobic barrier that guards against moisture and staining, plus a clear, natural finish that keeps textures visible. It is ideal for porous brick surfaces needing long-lasting protection without film formation. Applications range from masonry walls to exterior fences and garden features, helping to reduce efflorescence and deterioration over time.
Rain Guard Water Sealers Brick Sealer — 1 Gallon (Natural Finish)
This 1-gallon option mirrors the first product’s performance, offering superior protection through a hydrophobic seal that penetrates brick and mortar. It safeguards surfaces from water intrusion, freeze-thaw damage, and staining while preserving a natural look. The sealer dries with a subtle finish that does not gloss, keeping brick’s authentic texture visible for both indoor and outdoor projects.
Usage is straightforward on walls, walkways, chimneys, or other porous brick, and the long-lasting protection helps reduce maintenance needs in exposed locations exposed to harsh weather conditions.
Thompson’s WaterSeal Multi-Surface Waterproofer Stain — Clear, 1 Gallon
Thompson’s WaterSeal Clear Multi-Purpose Waterproof Stain provides a waterproofing layer that enhances concrete, brick, exterior wood, and other exterior surfaces. This clear stain hides grain while preserving texture, delivering UV resistance for fade-proof color retention. It’s suitable for outdoor use where a natural look is preferred, and it reinforces durability against the elements without changing the brick’s character.
The finish is designed to maintain color depth and shading, offering a balance between protection and aesthetics. For projects involving exterior masonry exposures, this product can serve as a versatile coating that acts as both sealer and stain.
Rain Guard Water Sealers Brick Sealer — 5 Gallons (Natural Finish)
Designed for bigger projects, this 5-gallon option extends the same protective benefits as the 1-gallon variant with a natural finish. The penetrating sealer forms a breathable barrier that reduces moisture ingress, limits freeze-thaw damage, and minimizes efflorescence. The natural finish keeps brick tones intact and avoids glossy overlays, making it suitable for expansive brick surfaces such as walls, chimneys, and outdoor facades.
For contractors or homeowners tackling multiple surfaces, the larger volume reduces the need for frequent reapplication, while maintaining a low-profile, authentic brick appearance.
MasonryDefender Chimney Brick Sealer — 1 Gallon
This chimney-focused sealer is a clear, breathable water-based siloxane that forms a protective barrier on exterior vertical masonry surfaces. It bonds with brick and allows trapped moisture to escape, reducing the risk of cracks from freeze/thaw cycles. The non-film-forming sealant preserves surface color and texture while delivering durable protection against leaks in chimneys and other vertical masonry structures.
Because it is breathable, it helps maintain structural integrity over time without altering the visual character of brick chimneys or adjacent walls. It is suitable for residential or small commercial applications where moisture control is crucial.
Buying Guide: Key Purchase Considerations
- Surface compatibility: Choose a sealer compatible with brick, mortar, and any coatings already present. Penetrating silane/siloxane formulas typically outperform film-forming sealers on porous brick.
- Finish preference: Natural or satin finishes preserve the brick’s texture without gloss. Clear stains provide color enhancement while maintaining visibility of grain and texture.
- Application environment: Exterior bricks demand higher water repellency and UV resistance, while interior brick may require less intense protection. Consider humidity, exposure to rain, and freeze/thaw cycles.
- Volume needs: For larger areas, select a 5-gallon option to reduce frequent reapplication. For repairs or smaller projects, 1-gallon containers are typically sufficient.
- Breathability: Non-film-forming sealers allow moisture to escape, reducing the risk of moisture-related damage behind the coating. This is especially important for chimneys and older masonry.
- Maintenance and reapplication: Some sealers require reapplication every few years, depending on exposure and wear. Check manufacturer recommendations for intervals and surface prep steps.
- Color and sheen: Decide if you want a natural look, a satin finish, or a clear stain. This choice affects aesthetics as well as ease of cleaning.
- Safety and ventilation: Follow label directions for ventilation, surface prep, and PPE. Ensure the area is properly ventilated during and after application.
How To Choose: A Quick Decision Guide
- If protecting outdoor brick with minimal color change and a natural finish, choose Rain Guard Water Sealers Brick Sealer in Natural Finish (1 Gal or 5 Gal).
- If you want a breathable seal for chimneys or vertical masonry with no surface gloss, consider MasonryDefender Chimney Brick Sealer (1 Gal).
- For projects requiring a clear stain that preserves texture while adding UV resilience, Thompson’s WaterSeal Multi-Surface Stain (1 Gal) is suitable.
- For large-volume outdoor installations or multi-surface areas, the 5-gallon Rain Guard option offers economical coverage with the same performance.
- If interior and exterior brick may benefit from a satin finish that eases cleaning, MasonryDefender Brick Sealer Satin Sheen (1 Gal) provides a balanced option.