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20 Best Sealant For Water Leaks (2023 Updated)

Water sealant is a substance used to fill in cracks or holes in order to prevent water from leaking through. There are many different kinds of water sealant available on the market, and the best kind to use will depend on the specific leak that needs to be fixed.

For example, if a leak is small and only occurs when it rains, then a silicone-based sealant would likely be the best option. On the other hand, if a leak is larger and occurs even when there is no rain, then an epoxy-based sealant would be a better choice.

20 Best Sealant For Water Leaks

Product Image Product Name Features Price

Fix A Leak Pool Leak Sealer – 32 oz

  • Finds and fixes leaks fast
  • Permanently seals leaks and holes up to 1/8 inch in diameter in most any material including plumbing

Rust-Oleum Leak Seal Flexible Rubber Coating, Aluminum – 12 oz can

  • Seals leaks and cracks water-tight
  • Paintable finish
  • Great for gutters, roofs, flashing, ductwork, PVC

K Seal Heavy Duty Permanent Coolant Leak Sealer – 16 oz jug

  • Item Weight 544 g
  • Product Dimensions 15 x 10.4 x 4.8 cm
  • Item Weight 544 gm

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

Flex Seal Brite Liquid Rubber Sealant Coating, White – 14 oz can

  • Item Weight: 1.4 lb
  • Country of Origin: United States
  • Color: White

Underwater Magic Leakage Preventor, White, Size: One Size 6530-11

  • Use underwater and in wet areas
  • Pools and Spas
  • Repair or replace tiles

Gorilla Waterproof Patch & Seal Spray, Black, 16 Ounces, 2 Pack

  • 16 Ounces

Marlig Fixaleak32 Fix-A-Leak Pool or Spa 32 oz Liquid Sealant

  • Brand: Marlig
  • Fix A Leak 32Oz Bottle
  • Package Dimensions: 8.0 x 8.0 x 8.0 inches

Flex Seal Aerosol Spray, Clear – 14 oz bottle

  • Protective clothing recommended
  • Shake well and spray using an even sweeping motion
  • Apply several even coats until all cracks and holes have been filled

Rust-Oleum 265494 Spray Black Leak Sealer – 12 oz can

  • Seals leaks and cracks water-tight
  • Paintable finish
  • Great for gutters, roofs, flashing, ductwork, PVC, masonry, concrete and more

Flex Seal Liquid Rubber Sealant Coating, Black – 14 oz can

  • Weatherize your home
  • Foundation and concrete waterproofing
  • Indoor and outdoor projects

Fernox 61016 50ml LS-X External Leak Sealer

  • Ideal for use on compression joints and screwed fittings
  • Never sets rock hard, joints can easily be undone
  • Ready -to- use, no mixing

Flex Seal Liquid Rubber Sealant Coating, Clear, Minis – 2 oz

  • It’s an easy-to-use, portable, aerosol spray
  • Sprays out as a liquid and dries as a strong, rubberized coating
  • Stays flexible and pliable

Permatex 82099 Spray Sealant, 9 oz Aerosol Can, Liquid, Solvent

  • Seals and protects
  • Saves time and labor
  • Stops low-pressure leaks without disassembly

Leisure Time Leak Seal (1 qt)

  • Specially formulated for spas and hot tubs.
  • Convenient and easy-to-use formula repairs most spa hot tub surfaces.
  • Helps maintain your spa’s surface and plumbing for years of enjoyment.
Fix A Leak Pool Leak Sealer – 32 oz
  • Finds and fixes leaks fast
  • Permanently seals leaks and holes up to 1/8 inch in diameter in most any material including plumbing
Rust-Oleum Leak Seal Flexible Rubber Coating, Aluminum – 12 oz can
  • Seals leaks and cracks water-tight
  • Paintable finish
  • Great for gutters, roofs, flashing, ductwork, PVC
K Seal Heavy Duty Permanent Coolant Leak Sealer – 16 oz jug
  • Item Weight 544 g
  • Product Dimensions 15 x 10.4 x 4.8 cm
  • Item Weight 544 gm
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
Flex Seal Brite Liquid Rubber Sealant Coating, White – 14 oz can
  • Item Weight: 1.4 lb
  • Country of Origin: United States
  • Color: White
Underwater Magic Leakage Preventor, White, Size: One Size 6530-11
  • Use underwater and in wet areas
  • Pools and Spas
  • Repair or replace tiles
Gorilla Waterproof Patch & Seal Spray, Black, 16 Ounces, 2 Pack
  • 16 Ounces
Marlig Fixaleak32 Fix-A-Leak Pool or Spa 32 oz Liquid Sealant
  • Brand: Marlig
  • Fix A Leak 32Oz Bottle
  • Package Dimensions: 8.0 x 8.0 x 8.0 inches
Flex Seal Aerosol Spray, Clear – 14 oz bottle
  • Protective clothing recommended
  • Shake well and spray using an even sweeping motion
  • Apply several even coats until all cracks and holes have been filled
Rust-Oleum 265494 Spray Black Leak Sealer – 12 oz can
  • Seals leaks and cracks water-tight
  • Paintable finish
  • Great for gutters, roofs, flashing, ductwork, PVC, masonry, concrete and more
Flex Seal Liquid Rubber Sealant Coating, Black – 14 oz can
  • Weatherize your home
  • Foundation and concrete waterproofing
  • Indoor and outdoor projects
Fernox 61016 50ml LS-X External Leak Sealer
  • Ideal for use on compression joints and screwed fittings
  • Never sets rock hard, joints can easily be undone
  • Ready -to- use, no mixing
Flex Seal Liquid Rubber Sealant Coating, Clear, Minis – 2 oz
  • It’s an easy-to-use, portable, aerosol spray
  • Sprays out as a liquid and dries as a strong, rubberized coating
  • Stays flexible and pliable
Permatex 82099 Spray Sealant, 9 oz Aerosol Can, Liquid, Solvent
  • Seals and protects
  • Saves time and labor
  • Stops low-pressure leaks without disassembly
Leisure Time Leak Seal (1 qt)
  • Specially formulated for spas and hot tubs.
  • Convenient and easy-to-use formula repairs most spa hot tub surfaces.
  • Helps maintain your spa’s surface and plumbing for years of enjoyment.

1. Fix A Leak Pool Leak Sealer – 32 oz

Fix A Leak Pool Leak Sealer - 32 oz

  • Finds and fixes leaks fast
  • Permanently seals leaks and holes up to 1/8 inch in diameter in most any material including plumbing
  • Spa Dosage: 8 oz

Check Latest Price

Sold By Price
Amazon.com – Seller
eBay
Walmart
PoolSupplies.com

Product Details

Specifications

Details
Size Size: 32 oz

Reviews From Real Customers

barrfulle-26
kojaone
robert

2. Rust-Oleum Leak Seal Flexible Rubber Coating, Aluminum – 12 oz can

Rust-Oleum Leak Seal Flexible Rubber Coating, Aluminum - 12 oz can

  • Seals leaks and cracks water-tight
  • Paintable finish
  • Great for gutters, roofs, flashing, ductwork, PVC

Check Latest Price

Sold By Price
Amazon.com
eBay
Walmart
Valu Home Centers

Product Details

Specifications

Details
Color Aluminum
Product Type Leakseal Flexible Rubber Sealant
Durability 1 Year
Fiber Reinforced No
Cold Application Yes

Reviews From Real Customers

SouthwestTraveler
browningwd
CaffeineAficionado

3. K Seal Heavy Duty Permanent Coolant Leak Sealer – 16 oz jug

K Seal Heavy Duty Permanent Coolant Leak Sealer - 16 oz jug

  • Item Weight 544 g
  • Product Dimensions 15 x 10.4 x 4.8 cm
  • Item Weight 544 gm

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Sold By Price
Amazon.com
eBay
Walmart
JBTools.com

Product Details

Specifications

Details
Product Dimensions 5.9 x 4.1 x 1.9 inches
Country of Origin USA
Is Discontinued By Manufacturer No

Reviews From Real Customers

H.G.R.
D.B.P.
K.

4. 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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Sold By Price
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.

5. Flex Seal Brite Liquid Rubber Sealant Coating, White – 14 oz can

Flex Seal Brite Liquid Rubber Sealant Coating, White - 14 oz can

  • Item Weight: 1.4 lb
  • Country of Origin: United States
  • Color: White
  • Brand name: Flex Seal

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Sold By Price
Amazon.com – Seller
Flex Seal Official Store
Dollar General
Acme Tools

Product Details

Specifications

Details
Units in Package 1
Unit Size 14 oz
Directions So easy to use! Protective clothing recommended. Use in a well ventilated area. Shake well for one minute. Spray using an even sweeping motion. Spray a larger area than where the leak occurred and feather edges. Allow Flex Seal to dry completely before applying your next coat. Apply several even coats instead of one thick coat. Works best at can temperatures above 60 degrees F. Occasionally shake can throughout application. Note: After each use, invert can and apply a short burst to clear nozzle.
Warnings Danger: Extremely flammable. Harmful or fatal if swallowed. Vapor Harmful. May cause eye, skin, and respiratory tract irritation. Contents under pressure. Danger: Contains Toluene (108-88-3), Odorless Mineral Spirits (64742-48-9), Aliphatic Petroleum Solvent (64742-89-8), Titanium Dioxide (13463-67-7) and Liquefied Petroleum Gas (68476-86-8). Use only in a well ventilated area. Intentional misuse by concentrating and inhaling the product can be harmful or fatal. Do not use near heat, sparks or open flame. Avoid contact with eyes or prolonged contact with skin. Do not puncture or incinerate container. Do not expose to heat or store at temperatures above 120 degrees F. Warning this product contains a chemical known to the state of California to cause cancer and birth defects or other reproductive harm. First Aid: If Eye Contact: flush with large amounts of cool running water for at least 15 minutes while holding upper and lower lids open. Remove contact lenses, if present and easy to do. If irritation persists get medical attention immediately. If Skin Contact: wash with soap and water. If irritation persists get medical attention immediately. Excessive Inhalation: Remove to fresh air. Seek medical attention immediately. If breathing stops give artificial respiration. If Ingested: Do not induce vomiting. Seek medical attention immediately.

Reviews From Real Customers

nihilum13

6. Underwater Magic Leakage Preventor, White, Size: One Size 6530-11

Underwater Magic Leakage Preventor, White, Size: One Size 6530-11

  • Use underwater and in wet areas
  • Pools and Spas
  • Repair or replace tiles
  • Repair fish tanks, ponds and fountains
  • 100% Silicone Free

Check Latest Price

Sold By Price
Amazon.com – Seller
Wild West Pool Supplies

Product Details

Specifications

Details
Product Dimensions 8.5 x 2 x 2.5 inches
Is Discontinued By Manufacturer No

Reviews From Real Customers

James M.
discovermystore.com
Gasman59

7. Gorilla Waterproof Patch & Seal Spray, Black, 16 Ounces, 2 Pack

Gorilla Waterproof Patch & Seal Spray, Black, 16 Ounces, 2 Pack

  • 16 Ounces

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Sold By Price
Amazon.com
Walmart – Flaritys

Product Details

Specifications

Details
Size 2 Pack

Reviews From Real Customers

zukus

8. Marlig Fixaleak32 Fix-A-Leak Pool or Spa 32 oz Liquid Sealant

Marlig Fixaleak32 Fix-A-Leak Pool or Spa 32 oz Liquid Sealant

  • Brand: Marlig
  • Fix A Leak 32Oz Bottle
  • Package Dimensions: 8.0 x 8.0 x 8.0 inches

Check Latest Price

Sold By Price
Amazon.com
eBay – widestep
Walmart
ShopChimney.com

Product Details

Specifications

Details
Recommended Use Swimming Pool
Assembled Product Dimensions (L x W x H) 1.00 x 1.00 x 1.00 Inches

Reviews From Real Customers

Reviewed by Pool and Spa Warehouse customer
iixeb
denissong

9. Marlig Fix A Leak 32oz Pool and Spa Leak Stop

Marlig Fix A Leak 32oz Pool and Spa Leak Stop

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Sold By Price
Amazon
eBay
Walmart
Leslie’s Pool Supplies

Product Details

Specifications

Details
Alternate Model Numbers FAL-32 FAL32
Ship Weight (lbs) 3.1

Reviews From Real Customers

Ian C
tsch-ro
w2sweets

10. Flex Seal Aerosol Spray, Clear – 14 oz bottle

Flex Seal Aerosol Spray, Clear - 14 oz bottle

  • Protective clothing recommended
  • Shake well and spray using an even sweeping motion
  • Apply several even coats until all cracks and holes have been filled
  • Allow to dry completely before applying the next coat. Fully cures in 24 hours
  • Spray a larger area than where the leak occurred and feather edges

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Sold By Price
Amazon
Home Depot
Lowe’s
Flex Seal Official Store

Product Details

Specifications

Details
Product Type Sealer
Container Type Spray can
State Liquid
Recommended Use Porcelain, glass, rubber, tile, plastic, metal, vinyl, fabric, aluminum, concrete surfaces, wood, cement, roof, masonry, drywall
Features Corrosion protection

11. Rust-Oleum 265494 Spray Black Leak Sealer – 12 oz can

Rust-Oleum 265494 Spray Black Leak Sealer - 12 oz can

  • Seals leaks and cracks water-tight
  • Paintable finish
  • Great for gutters, roofs, flashing, ductwork, PVC, masonry, concrete and more

Check Latest Price

Sold By Price
Amazon
Home Depot
McGuckin Hardware
Hellers Hardware

Product Details

Specifications

Details
Manufacturer Part Number 265494
Product Name Flexible Rubber Coating Spray
Packaged Quantity 1
Product Type Sealing Spray
Product Color Black

Reviews From Real Customers

tadl
dissatisfied

12. Flex Seal Liquid Rubber Sealant Coating, Black – 14 oz can

Flex Seal Liquid Rubber Sealant Coating, Black - 14 oz can

  • Weatherize your home
  • Foundation and concrete waterproofing
  • Indoor and outdoor projects
  • Seal cracks and holes
  • Pools and pool equipment

Check Latest Price

Sold By Price
Amazon
Home Depot
Lowe’s
Flex Seal Official Store

Product Details

Specifications

Details
Product Type Sealer
Container Type Spray can
State Liquid
Recommended Use Porcelain, glass, rubber, tile, plastic, metal, vinyl, fabric, aluminum, concrete surfaces, wood, cement, roof, masonry, drywall
Features Corrosion protection

13. Rust-Oleum 265494 350ml Leak Seal Flexible Rubber Sealant, Black

Rust-Oleum 265494 350ml Leak Seal Flexible Rubber Sealant, Black

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Amazon
eBay
Diamond Tool Store
Do it Best

Product Details

14. 13.75 oz. LeakSeal Clear Bonus Spray

13.75 oz. LeakSeal Clear Bonus Spray

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Amazon
MechanicSurplus.com

Product Details

15. Flex Seal Black Liquid Rubber Sealant Coating

Flex Seal Black Liquid Rubber Sealant Coating

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Sold By Price
Amazon
eBay
Walmart
Lowe’s

Product Details

Specifications

Details
Assembled Product Weight 2 lbs
Assembled Product Dimensions (L x W x H) 4.25 x 4.25 x 4.75 Inches

16. Fernox 61016 50ml LS-X External Leak Sealer

Fernox 61016 50ml LS-X External Leak Sealer

  • Ideal for use on compression joints and screwed fittings
  • Never sets rock hard, joints can easily be undone
  • Ready -to- use, no mixing
  • WRAS approved product
  • completely safe to use with drinking water Fernox 61016 50ml LS-X External Leak Sealer

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Sold By Price
Amazon
Bonanza – roxy media’s booth

Product Details

Specifications

Details
Product Genre/Category Home & Garden

Reviews From Real Customers

stench
GodSaveTheQueen
homeicustomer

17. Flex Seal Liquid Rubber Sealant Coating, Clear, Minis – 2 oz

Flex Seal Liquid Rubber Sealant Coating, Clear, Minis - 2 oz

  • It’s an easy-to-use, portable, aerosol spray
  • Sprays out as a liquid and dries as a strong, rubberized coating
  • Stays flexible and pliable
  • Lightweight, portable and so easy to use
  • Available in three (3) colors

Check Latest Price

Sold By Price
Amazon
Walmart
Home Depot
Flex Seal Official Store

Product Details

Specifications

Details
Units in Package 1
Unit Size 2 oz
Directions So easy to use! Read entire can. Wear face and eye protection, protective gloves and clothing; Make sure the area is clean, dry and free of grease, oil & dirt; Shake well: Spray 8 inches to 12 inches from surface; Apply several coats until all cracks and holes have been filled. Allow 24 to 48 hours to fully cure. Not recommended for extreme heat or gasoline related applications. Do not use on high pressure areas or tires. Works best at can temperatures above 60 degrees F. Note: After each use, invert can and apply a short burst to clear nozzle. Not intended for use by professional roofers. This product has not been tested for use in potable water systems. May not be compatible with all plastics, vinyls & rubbers.
Warnings This product can expose you to chemicals including ethyl benzene, which is known to the state of California to cause cancer, and toluene, which is known to the state of California to cause birth defects or other reproductive harm. For more info go to www.P65Warnings.ca.gov. Danger: Extremely flammable. Harmful or fatal if swallowed. Vapor harmful. May cause eye, skim, and respiratory tract irritation. Contents under pressure. See other cautions on back panel. Danger: Contains (CAS No): Toluene (108-88-3), Acetone (67-64-1), parachlorobenzotrifluoride (98-56-6), solvent naptha (petroleum), light aromoatic (64742-89-8) and liquefied petroleum gas (68476-86-8). Use only in a well ventilated area. When using inside, prevent vapor buildup by opening doors and windows. Ensure fresh air entry during application and drying. Do not use near heat, sparks, pilot lights or other sources of ignition. Do not smoke. When covering large areas indoors eliminate ignition sources far from the point of use because vapors are heavier than air and significant distances. Intentional misuse by concentrating and inhaling the product can be harmful or fatal. Avoid contact with eyes or prolonged contact with skin. Do not puncture or incinerate container. Do not expose to heat or store at temperatures above 120 degrees F. First Aid: If Eye Contact: Flash with large amounts of cool running water for at least 15 minutes while holding upper and lower lids open. Remove contact lenses, if present and easy to do. If irritation persists get medical attention immediately. If Skin Contact: Wash with soap and water. If irritation persists seek medical attention. Excessive Inhalation: Remove to fresh air. Seek medical attention immediately. If breathing stops give artificial respiration. If Ingested: Do not induce vomiting. Seek medical attention immediately. Keep out of reach of children.

Reviews From Real Customers

dan65441
TheWei

18. Permatex 82099 Spray Sealant, 9 oz Aerosol Can, Liquid, Solvent

Permatex 82099 Spray Sealant, 9 oz Aerosol Can, Liquid, Solvent

  • Seals and protects
  • Saves time and labor
  • Stops low-pressure leaks without disassembly
  • Eliminates the need for liquid-additive sealers that can swell internal seals

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Sold By Price
eBay
Walmart
Advance Auto Parts
Valu Home Centers

Product Details

Specifications

Details
Units in Package 1
Unit Size 9 oz aerosol can

Reviews From Real Customers

G.
S.
injac

19. Permatex 9 oz. Aerosol Spray Leak Sealer 82099 82099 575704

Permatex 9 oz. Aerosol Spray Leak Sealer 82099 82099 575704

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Sold By Price
Walmart – ADVENTURERS BAG

Product Details

Reviews From Real Customers

H.E.D.

20. Leisure Time Leak Seal (1 qt)

Leisure Time Leak Seal (1 qt)

  • Specially formulated for spas and hot tubs.
  • Convenient and easy-to-use formula repairs most spa hot tub surfaces.
  • Helps maintain your spa’s surface and plumbing for years of enjoyment.

Check Latest Price

Sold By Price
Aqua Supercenter
Wild West Pool Supplies
POOLplaza
Your Pool HQ

Product Details

Specifications

Details
Weight 50.41 lb

Reviews From Real Customers

Acurlyqt
Grandmkmk
Philip N.

Conclusion

After years of research, scientists have finally developed a sealant that can effectively stop water leaks. This sealant is made from a special polymer that is able to bond with water molecules and create a water-tight seal.

This sealant can be used to fix leaks in pipes, plumbing fixtures, and even swimming pools.

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