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20 Best Chimney Waterproofing Products (2022 Updated)

Chimney waterproofing products are used to prevent water from entering the chimney. They are typically applied to the exterior of the chimney, and can be in the form of a paint, coating, or sealant. Waterproofing products can help to extend the life of the chimney by preventing water damage.

20 Best Chimney Waterproofing Products

Product Image Product Name Features Price

ChimneyRx Brushable Chimney Crown Repair, 1 Gallon

  • 1 Gallon

Thompson's WaterSeal Clear Multi-Surface Waterproofer – 12 oz spray bottle

  • Size: 12 ounce
  • Approximate Coverage: 50 Sq. Ft/Can
  • Prevents Water Damage

Gorilla 14 oz. Clear Waterproof Patch & Seal Spray

  • 14 Ounces

Gorilla 32 oz. Clear Waterproof Patch & Seal Liquid

  • 32 oz

Thompsons Waterseal 24111 1.2 Gallon Clear

  • Prevents water damage
  • Beads and waterproofs a variety of surfaces
  • Works on masonry, brick, concrete, decks, fences, etc

Thompsons Waterseal 21802 VOC Wood Protector, 1.2-Gallon, Clear

  • Item Weight: 9.65 lb
  • Country of Origin: China
  • Brand name: Thompsons Water Seal

Rustoleum Leakseal All-purpose Flexible Rubber Coating Sealant Spray, Clear – 11 oz can

  • 11 oz

Loctite Waterproof Sealant, Clear Silicone, Transparent – 2.7 fl oz

  • A multipurpose adhesive and sealant
  • Creates a waterproof, protective seal that is ideal for metal, glass, rubber, tile and porcelain

Flex Seal Sealant Coating, Black, Liquid Rubber – 16 fl oz

  • Creates a Watertight Flexible Rubberized Coating
  • Blocks Out Air Water and Moisture
  • Prevents Rust and Corrosion

ChimneyRx Masonry Chimney Water Repellent 1 Gallon

  • Prevents Water Penetration
  • Keep Masonry Looking New
  • Will Not Alter Surface Appearance

Drylok 28613 Extreme Masonry Waterproofer, 1 Gallon, White

  • 1 Gallon

Seal Krete 100001 Clear Acrylic Original Water Proofing Primer/Sealer, 1-Gallon

  • Bonding clear sealer
  • A waterbased, acrylic application designed to protect above ground vertical concrete and masonry su
  • The sealer penetrates deep into the pores of concrete, binding sand and cement particles to form a t

Drylok White Latex Masonry Waterproofer, 1 gal.

  • 1 Gal

LastiSeal 5 gal. Penetrating Waterproofing Brick Paver and Concrete Sealer

  • 5 Gal

DAP Concrete and Mortar Filler and Sealant, Gray – 10.1 fl oz tube

  • For filling and sealing cracks
  • Durable and flexible
  • Resist gas, oil, grease, and salt

ChimneyRx Brushable Chimney Crown Repair, 2 Gallon, Men's, Clear

  • Fast-setting, Flexible Coating that Seals and Protects Chimney Crown Tops – Repairs Cracked Chimney Crowns and Prevents Chimney Leaks

Dap 18388 Ultra Clear Waterproof Sealant, 10.1 oz

  • Withstands temperature & weather fluctuations without cracking
  • Non-Yellowing and UV Resistant
  • Clearer than Silicone
ChimneyRx Brushable Chimney Crown Repair, 1 Gallon
  • 1 Gallon
Thompson's WaterSeal Clear Multi-Surface Waterproofer – 12 oz spray bottle
  • Size: 12 ounce
  • Approximate Coverage: 50 Sq. Ft/Can
  • Prevents Water Damage
Gorilla 14 oz. Clear Waterproof Patch & Seal Spray
  • 14 Ounces
Gorilla 32 oz. Clear Waterproof Patch & Seal Liquid
  • 32 oz
Thompsons Waterseal 24111 1.2 Gallon Clear
  • Prevents water damage
  • Beads and waterproofs a variety of surfaces
  • Works on masonry, brick, concrete, decks, fences, etc
Thompsons Waterseal 21802 VOC Wood Protector, 1.2-Gallon, Clear
  • Item Weight: 9.65 lb
  • Country of Origin: China
  • Brand name: Thompsons Water Seal
Rustoleum Leakseal All-purpose Flexible Rubber Coating Sealant Spray, Clear – 11 oz can
  • 11 oz
Loctite Waterproof Sealant, Clear Silicone, Transparent – 2.7 fl oz
  • A multipurpose adhesive and sealant
  • Creates a waterproof, protective seal that is ideal for metal, glass, rubber, tile and porcelain
Flex Seal Sealant Coating, Black, Liquid Rubber – 16 fl oz
  • Creates a Watertight Flexible Rubberized Coating
  • Blocks Out Air Water and Moisture
  • Prevents Rust and Corrosion
ChimneyRx Masonry Chimney Water Repellent 1 Gallon
  • Prevents Water Penetration
  • Keep Masonry Looking New
  • Will Not Alter Surface Appearance
Drylok 28613 Extreme Masonry Waterproofer, 1 Gallon, White
  • 1 Gallon
Seal Krete 100001 Clear Acrylic Original Water Proofing Primer/Sealer, 1-Gallon
  • Bonding clear sealer
  • A waterbased, acrylic application designed to protect above ground vertical concrete and masonry su
  • The sealer penetrates deep into the pores of concrete, binding sand and cement particles to form a t
Drylok White Latex Masonry Waterproofer, 1 gal.
  • 1 Gal
LastiSeal 5 gal. Penetrating Waterproofing Brick Paver and Concrete Sealer
  • 5 Gal
DAP Concrete and Mortar Filler and Sealant, Gray – 10.1 fl oz tube
  • For filling and sealing cracks
  • Durable and flexible
  • Resist gas, oil, grease, and salt
ChimneyRx Brushable Chimney Crown Repair, 2 Gallon, Men's, Clear
  • Fast-setting, Flexible Coating that Seals and Protects Chimney Crown Tops – Repairs Cracked Chimney Crowns and Prevents Chimney Leaks
Dap 18388 Ultra Clear Waterproof Sealant, 10.1 oz
  • Withstands temperature & weather fluctuations without cracking
  • Non-Yellowing and UV Resistant
  • Clearer than Silicone

1. ChimneyRx Brushable Chimney Crown Repair, 1 Gallon

ChimneyRx Brushable Chimney Crown Repair, 1 Gallon

  • 1 Gallon

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Northline Express

Product Details

Specifications

Details
Weight 11 lb

Reviews From Real Customers

locked23
1914caddy
QuickenUser

2. Chimney RX Brushable Crown Repair Elastomeric Sealant

Chimney RX Brushable Crown Repair Elastomeric Sealant

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Amazon.com – Seller
eBay – promax_supply
Walmart
Sears – Ami Ventures Inc

Product Details

Specifications

Details
Assembled Product Weight 2 lb

Reviews From Real Customers

Joel
vvc60

3. Thompson’s WaterSeal Clear Multi-Surface Waterproofer – 12 oz spray bottle

Thompson's WaterSeal Clear Multi-Surface Waterproofer - 12 oz spray bottle

  • Size: 12 ounce
  • Approximate Coverage: 50 Sq. Ft/Can
  • Prevents Water Damage
  • Beads and Waterproofs
  • Allows Wood to Gray Naturally

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Amazon.com – Seller
Walmart
Lowe’s
Ace Hardware

Product Details

Specifications

Details
Base Type Water-Based
Indoor or Outdoor Outdoor
Product Type Multi-Surface Waterproofer
Paintable Yes
Transparency Fully-Transparent

Reviews From Real Customers

timt_us_vnhfbfwvw
stephan7925
Seisin

4. Gorilla 14 oz. Clear Waterproof Patch & Seal Spray

Gorilla 14 oz. Clear Waterproof Patch & Seal Spray

  • 14 Ounces

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Walmart
Home Depot
Valu Home Centers

Product Details

Specifications

Details
Size 1 – Pack

Reviews From Real Customers

zukus
Dulcymcgraw
gorillatough.com

5. Gorilla 32 oz. Clear Waterproof Patch & Seal Liquid

Gorilla 32 oz. Clear Waterproof Patch & Seal Liquid

  • 32 oz

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Amazon.com
Home Depot
FindTape.com
NAPA Auto Parts

Product Details

Specifications

Details
Coating Material Liquid Rubber
Color Clear
Maximum Working Temperature -50 °F
Tintable No
Indoor or Outdoor Indoor and Outdoor

Reviews From Real Customers

Schukart88
DFair
Bunnylove77

6. Thompsons Waterseal 24111 1.2 Gallon Clear

Thompsons Waterseal 24111 1.2 Gallon Clear

  • Prevents water damage
  • Beads and waterproofs a variety of surfaces
  • Works on masonry, brick, concrete, decks, fences, etc
  • Exterior use only

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Amazon.com – Seller
eBay
Walmart
Lowe’s

Product Details

Specifications

Details
Transparency Fully-Transparent
Product Type Multi-Surface Waterproofer
Indoor or Outdoor Outdoor
VOC Level Low VOC
Paintable Yes

Reviews From Real Customers

Disappointed Lady

7. Thompsons Waterseal 21802 VOC Wood Protector, 1.2-Gallon, Clear

Thompsons Waterseal 21802 VOC Wood Protector, 1.2-Gallon, Clear

  • Item Weight: 9.65 lb
  • Country of Origin: China
  • Brand name: Thompsons Water Seal
  • Item Dimensions: 4.1”L x 6.6”W x 11.0”H

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Amazon.com – Seller
eBay
Walmart
Fred Meyer

Product Details

Specifications

Details
Container Size 1 GALLON
Application Method Brush Pad Roller Spray
Product Type Sealant
Color Clear
Product Weight 9.6500 lb

Reviews From Real Customers

susan
designer_handbag_babe

8. Rustoleum Leakseal All-purpose Flexible Rubber Coating Sealant Spray, Clear – 11 oz can

Rustoleum Leakseal All-purpose Flexible Rubber Coating Sealant Spray, Clear - 11 oz can

  • 11 oz

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Amazon.com
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Walmart
Tractor Supply Company

Product Details

Specifications

Details
Color Clear
Product Type Leakseal Flexible Rubber Sealant
Cold Application Yes
Water Based Yes
Durability 1 Year

Reviews From Real Customers

Suresh
AluminumBoatGuy

9. Loctite Waterproof Sealant, Clear Silicone, Transparent – 2.7 fl oz

Loctite Waterproof Sealant, Clear Silicone, Transparent - 2.7 fl oz

  • A multipurpose adhesive and sealant
  • Creates a waterproof, protective seal that is ideal for metal, glass, rubber, tile and porcelain
  • Designed to be used indoors and outdoors
  • Repairs everything from electrical connections to seams on boots to stop leaks in wet weather
  • Impact resistant and flexes with materials

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Home Depot
Lowe’s
Valu Home Centers

Product Details

Specifications

Details
Units in Package 1
Unit Size 2.7 fl oz
Directions Protect work area. Surfaces must be clean, dry and free of old caulk, grease, dust and other contaminants. Pierce tube with point at end of cap. Attach nozzle & cut to desired bead size. 1. As an Adhesive: Apply a continuous, even bead of silicone to one surface. Assemble parts immediately. Leave bond undisturbed for at least 2 hours. As a Sealant: Hold tube at angle. Apply by pushing silicone into joint. 2. Clean-Up: Uncured: mineral spirits. Cured: Carefully scrape excess with razor blade of sharp-edged too. Open Time: Tack Free Time: 45 minutes. Cure Time: 24 hours. Cure time dependent on temperature, humidity and thickness of product used. Cured Form: Transparent, non-flammable, flexible solid. Tensile Strength: 325 psi. Application Temp: Above: -35 degrees F (-37 degrees C) to 140 degrees F (60 degrees C). Withstands: Short Term: -50 degrees F (-46 degrees C) to 392 degrees F (200 degrees C); Long Term: -50 degrees F (-46 degrees C) to 350 degrees F (177 degrees C). Not Recommended for: Not paintable. Do not use on marble, limestone, brass, copper, magnesium, iron, zinc or galvanized metals. Hard to bond plastics such as PE, PP, PTFE, PMMA, PC, or PVC. Not suitable for below grade.
Warnings Prolonged or repeated contact with uncured adhesive may cause eye, skin and respiratory tract irritation. Repeated or prolong contact may cause allergic skin reaction. Read carefully cautions. Contains petroleum distillate, alkyl acetoxysilane and acetic acid. Acetic acid, which irritates eyes, skin, and respiratory tract, is released during curing. Avoid breathing vapors. Use with adequate ventilation. Do not get in eyes, or skin or on clothing. First Aid: In case of skin contact wipe off and wash with soap and water. In case of eye contact flush with water for 15 minutes, call a physician immediately. For respiratory difficulty, move to fresh air. If swallowed, do not induce vomiting. Call a physician immediately. Keep out of reach of children. Chemically Curing Sealant – VOC 3%.

Reviews From Real Customers

TanyaL
Warrior5
jcksrobbins

10. Flex Seal Sealant Coating, Black, Liquid Rubber – 16 fl oz

Flex Seal Sealant Coating, Black, Liquid Rubber - 16 fl oz

  • Creates a Watertight Flexible Rubberized Coating
  • Blocks Out Air Water and Moisture
  • Prevents Rust and Corrosion
  • Mildew and Chemical Resistant
  • Non-Hazardous Non-Flammable

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Amazon.com
Flex Seal Official Store
Rural King
Farm & Home Hardware

Product Details

Specifications

Details
Units in Package 1
Unit Size 16 fl oz
Directions Surface must be clean, dry and free of grease, oil and dirt. Increase adhesion by etching surface with sandpaper. Brush, roll, dip or pour directly onto surface. Coat entire surface until all cracks and holes are completely filled. Apply additional coats as needed. Allow each coat to dry completely before adding additional coats. Allow 24 to 48 hours or more to dry. Covers up to 18.75 Square Feet. All cracks and holes must be completely filled and dry before testing product. Clean Up: Wet Flex Seal Liquid can be easily cleaned with a dry cloth or paper towel. Brushes and rollers can be cleaned with mineral spirits. Not intended for professional roofers. Protective clothing is recommended. Stir can well, do not shake.
Warnings Caution: Combustible liquid harmful if swallowed. Eye Contact: If product enters the eyes, open eyes while under gentle running water for at least 15 minutes. Seek medical attention if irritation persists. Skin contact: Wash skin thoroughly after handling. Seek medical attention if irritation develops and persists. Remove contaminated clothing. Launder contaminated clothing before re-use. Inhalation: If breathing becomes difficult, remove victim to fresh air. Seek medical attention if breathing difficulty continues. Ingestion: If product is swallowed do not induce vomiting. Call poison control or seek medical attention. Keep out of the reach of children.

Reviews From Real Customers

Vegasaur
bluejeep153

11. ChimneyRx Masonry Chimney Water Repellent 1 Gallon

ChimneyRx Masonry Chimney Water Repellent 1 Gallon

  • Prevents Water Penetration
  • Keep Masonry Looking New
  • Will Not Alter Surface Appearance
  • Mildew/Fungus Resistant
  • Water-Based, Environmentally Friendly

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Northline Express

Product Details

Specifications

Details
Assembled Product Weight 2 lb

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fsc_us_dzk8ho
vincent
HandyAndy1

12. Drylok 28613 Extreme Masonry Waterproofer, 1 Gallon, White

Drylok 28613 Extreme Masonry Waterproofer, 1 Gallon, White

  • 1 Gallon

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Details
Manufacturer Part Number 28613
Product Name 32 CD Album
Product Type Optical Disc Case
Style Album
Case Capacity 32

Reviews From Real Customers

-my junk email”] ”Bill
Ted
Chee

13. Super Thoroseal 35 lb Waterproof Coating

Super Thoroseal 35 lb Waterproof Coating

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Valu Home Centers
Dwyer Bros

Product Details

Specifications

Details
Base Type Cement-Based
Container Size 35
Indoor or Outdoor Indoor and Outdoor
Full Cure Time 7 day
Time Before Recoating 6 hr

Reviews From Real Customers

Crazy Cannuck
Dixi

14. Seal Krete 100001 Clear Acrylic Original Water Proofing Primer/Sealer, 1-Gallon

Seal Krete 100001 Clear Acrylic Original Water Proofing Primer/Sealer, 1-Gallon

  • Bonding clear sealer
  • A waterbased, acrylic application designed to protect above ground vertical concrete and masonry su
  • The sealer penetrates deep into the pores of concrete, binding sand and cement particles to form a t
  • It is excellent for binding chalky surfaces to improve paint adhesion on either painted or unpainted
  • Seal-Krete strengthens mortar joints, reduces efflorescence on brick, and acts as a colour rejuvenato

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Size 1 Gal.

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Jerry

15. Drylok White Latex Masonry Waterproofer, 1 gal.

Drylok White Latex Masonry Waterproofer, 1 gal.

  • 1 Gal

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Home Depot
Lowe’s
Blain’s Farm & Fleet

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Details
Container Size 1 gal.

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chiner
Satisfied

16. LastiSeal 5 gal. Penetrating Waterproofing Brick Paver and Concrete Sealer

LastiSeal 5 gal. Penetrating Waterproofing Brick Paver and Concrete Sealer

  • 5 Gal

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Amazon
eBay – homegoodsdelivered
Home Depot
The BuildClub

Product Details

Specifications

Details
Transparency Transparent
Container Size 5 Gallon
Application Method Brush,Pump-up Sprayer,Roller
Color/Finish Clear/Matte
Interior/Exterior Exterior,Interior

Reviews From Real Customers

jgmor1
Lisa C. M.

17. Dap 5 oz. Ultra Clear All Purpose Waterproof Sealant

Dap 5 oz. Ultra Clear All Purpose Waterproof Sealant

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Walmart
Ace Hardware

Product Details

Specifications

Details
Product Type Sealant
Capacity 5 fl.oz
Application Areas Plastic, acrylonitrile butadiene styrene (ABS), brick, ceramics, glass, metal, porcelain, polyvinyl chloride (PVC), stone, wood, cement, plexiglas, aluminum, concrete, plaster, vinyl, tile, laminate, all purpose, drywall, fiberglass, painted wood, asphalt, lexan, formica, mortar, stucco
Color Crystal clear
Features Break-resistant, water-resistant, weatherproof, indoor/outdoor use, paintable, mildew-resistant, non-yellowing
Miscellaneous
Material Synthetic rubber
Package Tube
Application Temparature
Min -40 °F
Max 199.9 °F

18. DAP Concrete and Mortar Filler and Sealant, Gray – 10.1 fl oz tube

DAP Concrete and Mortar Filler and Sealant, Gray - 10.1 fl oz tube

  • For filling and sealing cracks
  • Durable and flexible
  • Resist gas, oil, grease, and salt
  • Easy water clean-up

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Lowe’s

Product Details

Specifications

Details
Container Size 10.1 oz
Color Gray
VOC Level 35 g/L
Fire and High Heat Resistant No
Indoor or Outdoor Indoor and Outdoor
Paintable Yes
Moisture Resistant Yes
Permanently Flexible Yes
Clean Up Soap and Water
Product Type Filler and Sealant
Coverage Area 56 linear ft
Brand Name DAP

19. ChimneyRx Brushable Chimney Crown Repair, 2 Gallon, Men’s, Clear

ChimneyRx Brushable Chimney Crown Repair, 2 Gallon, Men's, Clear

  • Fast-setting, Flexible Coating that Seals and Protects Chimney Crown Tops – Repairs Cracked Chimney Crowns and Prevents Chimney Leaks
  • Stops Chimney Water Leaks & Repairs Chimney Crown Cracks
  • Specifically Formulated to Repair and Protect Fireplace & Chimney Crowns from Water Intrusion
  • Covers Approximately 40 Square Feet per Gallon
  • Easy to Apply With a 3 Inch or 4 Inch Paint Brush, & Cures in 2-4 Hours

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Product Details

20. Dap 18388 Ultra Clear Waterproof Sealant, 10.1 oz

Dap 18388 Ultra Clear Waterproof Sealant, 10.1 oz

  • Withstands temperature & weather fluctuations without cracking
  • Non-Yellowing and UV Resistant
  • Clearer than Silicone
  • Immediate water ready, won’t wash out
  • Cured sealant is mold & mildew resistant

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Home Depot
Benjamin Moore Miramar Paint Center

Product Details

Specifications

Details
Product Type Sealant
Capacity 10.1 fl.oz
Application Areas Plastic, acrylonitrile butadiene styrene (ABS), brick, ceramics, glass, metal, porcelain, polyvinyl chloride (PVC), stone, wood, cement, plexiglas, aluminum, concrete, plaster, vinyl, tile, laminate, all purpose, drywall, fiberglass, painted wood, asphalt, lexan, formica, mortar, stucco
Color Crystal clear
Features Break-resistant, water-resistant, weatherproof, indoor/outdoor use, paintable, mildew-resistant, non-yellowing
Miscellaneous
Material Synthetic rubber
Package Tube
Application Temparature
Min -40 °F
Max 199.9 °F

Conclusion

There are many different types of chimney waterproofing products on the market, and it can be difficult to choose the right one for your needs. However, by taking the time to research the different options and understanding your own needs, you can find the perfect product to keep your chimney dry and protected.

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