9 Best brick sealer for chimneys of 2025

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Best Choice

1

CHIMNEYRX

ChimneyRx 300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon
9.7

Exceptional

Our Rating

8.9
Simple to use

8.4
worth the money
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Value for Money

2

CHIMNEYRX

ChimneyRx Advanced Water Repellent - Clear Sealer for Masonry Surfaces - High-Performance Polysiloxane Formula for Brick, Stone, & Concrete Waterproofing with Long Lasting Protection, 1-Gallon
9.6

Exceptional

Our Rating
3

MasonryDefender
MasonryDefender Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces - 1 Gal
Main highlights

Long-lasting Invisible Protection
Provides a non-glossy, invisible coat that protects masonry for up to 5 years without altering appearance.

Ideal for Chimney Waterproofing
Perfect for protecting brick chimneys from water damage, spalling, and freeze-thaw cycles.

Easy Application Praised by Users
Customers appreciate the simple application process using a garden sprayer.
Key specs
- coverage:90-150 sq.ft.
- item form:Liquid
- surface:Masonry surfaces
- material:Siloxane
- water resistance:Water-based
9.5

Excellent

Our Rating

9.9
Simple to use

9.9
Absorbency

9.7
Fashion
4

CHIMNEYRX
ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon
Main highlights

Waterproofing Performance
Provides a reliable barrier against water infiltration, protecting masonry surfaces from damage.

Ideal for New Chimneys
Perfect for new cement block chimneys to prevent water damage and extend lifespan.

Customer Satisfaction
Highly praised for effectively eliminating water leaks after application.
9.3

Excellent

Our Rating

9.7
Simple to use

9.5
Water tight

9.1
worth the money
5

MasonryDefender
MasonryDefender Chimney Crown Sealer - Brushable Sealant Fixes Cracked Chimney Tops & Prevents Chimney Leaks
Main highlights

Key Features
Elastomeric sealer for chimneys, prevents water leaks, permanently flexible, easy to apply, covers 20 sq. ft. per half gallon.

Ideal Use Cases
Best for sealing and waterproofing chimney crowns, ideal for maintenance and repair, preventing long-term weather-related damage.

Customer Reviews
Highly praised for its durability and effectiveness in stopping leaks, users appreciate its long-lasting protection and ease of application.
9.0

Excellent

Our Rating

9.9
Easy installation

9.9
Precision

9.9
Simple to use
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6

MasonryDefender
MasonryDefender Interior/Exterior Brick Sealer, Satin Sheen - Clear Water Based Acrylic Sealer - Reduces Brick Dust & Makes Interior & Exterior Brick Walls Easy to Clean - 1 Gallon
Main highlights

Versatile Application
Works as both an interior and exterior brick sealer for masonry walls.

Ideal for Dust Reduction
Perfect for minimizing brick dust on interior walls, creating a cleaner environment.

Praised for Easy Cleanup
Highly rated for its low odor and easy cleanup after application.
8.9

Very Good

Our Rating

9.5
Simple to use

9.3
Fashion

9.1
worth the money
7

Brick-Anew

Brick-Anew Fireplace Sealer 16 oz - Protects Brick, Stone, Concrete, Tile, & Porous Masonry, Prevents Stains & Residue from Soot, Smoke | Clear, Long-Lasting, Eco-Friendly | Indoor/Outdoor Sealer
8.7

Very Good

Our Rating
8

Rain Guard Water Sealers
Rain Guard Water Sealers SP-3001 Brick Sealer Concentrate Makes 1 Gallon - Clear Natural Finish - Deep Penetrating Water Repellent Protection for All Brick Surfaces - Water-Based Silane/Siloxane
Main highlights

Invisible Finish
Dries to an invisible, stain-resistant finish without yellowing.

Ideal for All Brick Surfaces
Perfect for vertical and horizontal surfaces like chimneys and patios.

Ease of Use
Simple application process praised by users.
Key specs
- coverage:Up to 300 sq ft
- item form:Liquid
- surface:Wall
- material:Silicone
- water resistance:Water Repellent
8.4

Good

Our Rating
9

DAP
DAP High Heat Fire Resistant Mortar, 10 Oz, Black (7079818854)
Main highlights

Key Features
Super tough, high temperature mortar by Dap; sets rock hard, stops air leaks, and saves energy. Applies easily for a durable finish.

Ideal Use Cases
Perfect for repairing or sealing furnaces, fireplaces, and flue pipes. Exceptional performance in high-temperature environments requiring a solid, air-tight seal.

Customer Reviews Summary
Most praised for its reliability and ease of application. Users appreciate its effectiveness in sealing and repairing, noting significant energy savings.
8.3

Good

Our Rating

9.1
Simple to use

8.7
Attachment

8.7
Simple to clean

9 Best brick sealer for chimneys of 2025

1

ChimneyRx 300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon

8.9

8.4

How do we rank?

How do we rank?

Analyzing top stores

2

ChimneyRx Advanced Water Repellent - Clear Sealer for Masonry Surfaces - High-Performance Polysiloxane Formula for Brick, Stone, & Concrete Waterproofing with Long Lasting Protection, 1-Gallon

3

MasonryDefender Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces - 1 Gal

9.9

9.9

9.7

4

ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon

9.7

9.5

9.1

5

MasonryDefender Chimney Crown Sealer - Brushable Sealant Fixes Cracked Chimney Tops & Prevents Chimney Leaks

9.9

9.9

9.9

6

MasonryDefender Interior/Exterior Brick Sealer, Satin Sheen - Clear Water Based Acrylic Sealer - Reduces Brick Dust & Makes Interior & Exterior Brick Walls Easy to Clean - 1 Gallon

9.5

9.3

9.1

7

Brick-Anew Fireplace Sealer 16 oz - Protects Brick, Stone, Concrete, Tile, & Porous Masonry, Prevents Stains & Residue from Soot, Smoke | Clear, Long-Lasting, Eco-Friendly | Indoor/Outdoor Sealer

8

Rain Guard Water Sealers SP-3001 Brick Sealer Concentrate Makes 1 Gallon - Clear Natural Finish - Deep Penetrating Water Repellent Protection for All Brick Surfaces - Water-Based Silane/Siloxane

9

DAP High Heat Fire Resistant Mortar, 10 Oz, Black (7079818854)

9.1

8.7

8.7

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