Chimney Brick Sealer Clear Water-Based Siloxane Sealer - Breathable

In this review of the Chimney Brick Sealer, the bottom line is simple: this siloxane, water-based sealer is for homeowners and DIYers who need a breathable, non-film waterproofing for vertical masonry that preserves appearance while reducing water intrusion risk. The reviewer found it easy to apply with a pump-up or garden sprayer, so it suits someone wanting a straightforward, VOC-compliant treatment for chimneys, brick walls, stone, or stucco. The single biggest reason to buy is its ability to form a long-lasting, penetrating bond that repels water while allowing trapped moisture to escape, helping prevent freeze/thaw damage.

Key Features

• Breathable protection: The siloxane formula soaks into masonry and allows trapped moisture to escape, reducing the risk of freeze/thaw damage over time.
• Water-based and VOC compliant: Cleanup after application is simple with water, and the product is easier to handle than solvent-based sealers.
• Non-film forming finish: Because it does not form a surface film, the sealer preserves the original color and appearance of brick, stone, and stucco.
• Durable waterproofing: The sealer creates a permanent bond with masonry to provide long-term resistance to leaks and water intrusion when applied correctly.
• Practical coverage and cure: Expect roughly 80-150 sq. ft. per gallon over two coats, with touch-dry in 2-6 hours and waterproof in 4-6 hours.

Who It's For

This product is aimed at homeowners, masons, and property managers who need a breathable, long-lasting sealer for vertical masonry like chimneys, exterior brick walls, stone veneers, or stucco. It fits DIYers who value a product that can be applied with a pump sprayer and cleaned up with water, and those wanting to protect structures from freeze/thaw cycles and water intrusion without changing surface color.

Those who need a surface film for high-traffic horizontal areas, or who require immediate heavy water pressure resistance right after a single coat, should consider a different product. Also, users expecting an opaque cosmetic coating rather than an invisible water repellent should look elsewhere.

Pros & Cons

Pros

• Easy to apply with a garden or pump-up sprayer, making DIY jobs quick and convenient.
• Breathable, non-film formulation preserves the look of masonry while repelling water.
• Water-based and VOC compliant for simpler cleanup and safer handling.
• Covers a practical area per gallon and cures to waterproof in several hours.

Cons

• Some users may find that it does not stop all leaks in every situation; performance depends on application and substrate condition.

Specifications

Our Verdict

The Chimney Brick Sealer is a practical, value-minded choice for anyone needing breathable masonry waterproofing that preserves appearance. It is best for chimneys and vertical exterior masonry where penetrating, long-lasting protection is the priority, and it delivers easy application and reasonable coverage. For users willing to prep surfaces and apply two coats, this sealer provides dependable protection and good value.

Frequently Asked Questions

How many coats are needed?
Apply two coats for the coverage and durability indicated; follow drying intervals between coats.

Can it change brick color?
No, the product is non-film forming and designed not to alter surface color when applied correctly.

How soon is it waterproof after application?
It dries to touch in 2-6 hours and should be waterproof within 4-6 hours, with continued strengthening over several weeks.