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20 Best Underwater Sealant For Pools (2023 Updated)

Underwater sealant is a type of sealant that is applied to the surface of pool walls and floors in order to create a watertight seal. This type of sealant is typically made from a silicone or urethane-based material, and is applied using a caulking gun.

Once applied, the sealant will need to cure for a period of time before the pool can be used.

20 Best Underwater Sealant For Pools

Product Image Product Name Features Price

Underwater Magic Sealant, White – 9.8 oz tube

  • No complicated mixing.
  • No clouds in your pool.
  • Use it while your pool is in use.

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

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

Underwater Magic UWM-04 290ml / 9.8oz Tube Sealant – Gray

  • No Complicated Mixing
  • No Clouds In Your Pool
  • Use It While Your Pool Is In Use

AquaBond Underwater Pool Repair Epoxy Kit Gray DMK-5200

  • Make long-lasting, professional repairs in and around swimming pools, spas and fountains.
  • No need to drain the pool! Specially formulated epoxy adhesive mixes, applies and cures underwater – or above!

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

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

3M 8027 Marine Silicone Sealant, White – 10 oz tube

  • DEVELOPED SPECIFICALLY AS A MARINE SEALANT – Stays tough and flexible for a wide range of uses above the waterline
  • VERY VERSATILE – Works on metal, glass, paint, fiberglass and more

Boss 802 2-Pack Clear Pro Grade Silicone Sealant for Pool, Spa, Household – 2 x 280ML. Tubes

  • Multi-Purpose Clear Silicone – Made in USA.
  • Tack free in 15 minutes – Cures fully in 24 hours.
  • Professional Grade for spa, pool, and general use.

Gorilla All-Purpose 100% Silicone Sealant, Clear – 10 fl oz tube

  • 10 oz

Atlas 530317 Pool Putty Black

  • Stops leaks, fills cracks, restores chipped tile.
  • Will cure under water.
  • Will not yellow or shrink Package Dimensions: 6.

Anderson FS4B 4oz Flexible Sealer Tube – Blue

  • Seals cracks in PVC, fiberglass, ceramics, plaster and gunite.
  • Make vinyl repairs above or below water, with or without a patch.

Gold Label Pond Sealant/Clear Caulk

  • Unique product that seals all types of leaks and cracks using moisture as a curing agent so no need to drain the water.
  • Suitable for all types of application Rubber/PVC/EPDM/Plastic/Glass.

3M Marine Grade Silicone Sealant – Clear – 3oz

  • 3M Marine Grade Silicone Sealant is a one-part, general all-purpose polyurethane that chemically reacts with moisture.
  • Flexible, bonds with good adhesion to wood, fiberglass, gelcoat, plastics and metals.

Underwater Magic UWM-09C 290ml/9.8oz Tube 12ct Black Sealant

  • No complicated mixing.
  • No clouds in your pool.
  • Use it while your pool is in use.

Sika 300ml 291 iCure Multipurpose Marine Sealant Clear 408851

  • Low odour, Non-corrosive, solvent free and very low VOC
  • Bonds well to a wide variety of marine substrates
  • Highly elastic and can be painted over

Leakmaster Pool Repair Putty PP701

  • Excellent Quality.
  • Great Gift Idea.
  • Satisfaction Ensured.

10.3 oz Silicone Adhesive Clear 80200B

  • All natural Enzyme
  • No more itching, No more rashes, No more scum lines
  • Reduces and/or eliminates the majority of your spa care chemical regimen including pH up, pH down, clarifiers and filter cleaning products
Underwater Magic Sealant, White – 9.8 oz tube
  • No complicated mixing.
  • No clouds in your pool.
  • Use it while your pool is in use.
Underwater Magic Leakage Preventor, White, Size: One Size 6530-11
  • Use underwater and in wet areas
  • Pools and Spas
  • Repair or replace tiles
Underwater Magic UWM-04 290ml / 9.8oz Tube Sealant – Gray
  • No Complicated Mixing
  • No Clouds In Your Pool
  • Use It While Your Pool Is In Use
AquaBond Underwater Pool Repair Epoxy Kit Gray DMK-5200
  • Make long-lasting, professional repairs in and around swimming pools, spas and fountains.
  • No need to drain the pool! Specially formulated epoxy adhesive mixes, applies and cures underwater – or above!
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
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
3M 8027 Marine Silicone Sealant, White – 10 oz tube
  • DEVELOPED SPECIFICALLY AS A MARINE SEALANT – Stays tough and flexible for a wide range of uses above the waterline
  • VERY VERSATILE – Works on metal, glass, paint, fiberglass and more
Boss 802 2-Pack Clear Pro Grade Silicone Sealant for Pool, Spa, Household – 2 x 280ML. Tubes
  • Multi-Purpose Clear Silicone – Made in USA.
  • Tack free in 15 minutes – Cures fully in 24 hours.
  • Professional Grade for spa, pool, and general use.
Gorilla All-Purpose 100% Silicone Sealant, Clear – 10 fl oz tube
  • 10 oz
Atlas 530317 Pool Putty Black
  • Stops leaks, fills cracks, restores chipped tile.
  • Will cure under water.
  • Will not yellow or shrink Package Dimensions: 6.
Anderson FS4B 4oz Flexible Sealer Tube – Blue
  • Seals cracks in PVC, fiberglass, ceramics, plaster and gunite.
  • Make vinyl repairs above or below water, with or without a patch.
Gold Label Pond Sealant/Clear Caulk
  • Unique product that seals all types of leaks and cracks using moisture as a curing agent so no need to drain the water.
  • Suitable for all types of application Rubber/PVC/EPDM/Plastic/Glass.
3M Marine Grade Silicone Sealant – Clear – 3oz
  • 3M Marine Grade Silicone Sealant is a one-part, general all-purpose polyurethane that chemically reacts with moisture.
  • Flexible, bonds with good adhesion to wood, fiberglass, gelcoat, plastics and metals.
Underwater Magic UWM-09C 290ml/9.8oz Tube 12ct Black Sealant
  • No complicated mixing.
  • No clouds in your pool.
  • Use it while your pool is in use.
Sika 300ml 291 iCure Multipurpose Marine Sealant Clear 408851
  • Low odour, Non-corrosive, solvent free and very low VOC
  • Bonds well to a wide variety of marine substrates
  • Highly elastic and can be painted over
Leakmaster Pool Repair Putty PP701
  • Excellent Quality.
  • Great Gift Idea.
  • Satisfaction Ensured.
10.3 oz Silicone Adhesive Clear 80200B
  • All natural Enzyme
  • No more itching, No more rashes, No more scum lines
  • Reduces and/or eliminates the majority of your spa care chemical regimen including pH up, pH down, clarifiers and filter cleaning products

1. Underwater Magic Sealant, White – 9.8 oz tube

Underwater Magic Sealant, White - 9.8 oz tube

  • No complicated mixing.
  • No clouds in your pool.
  • Use it while your pool is in use.
  • No silicone contamination.
  • Long lasting.

Check Latest Price

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

Product Details

Specifications

Details
Product Dimensions 9.05 x 1.95 x 1.95 inches
Is Discontinued By Manufacturer No

Reviews From Real Customers

pool-spa-supplies.com
Ana P.
fred_dude

2. 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

Matthew H

3. Underwater Magic UWM-04 290ml / 9.8oz Tube Sealant – Gray

Underwater Magic UWM-04 290ml / 9.8oz Tube Sealant - Gray

  • No Complicated Mixing
  • No Clouds In Your Pool
  • Use It While Your Pool Is In Use
  • No Silicone Contamination
  • Long Lasting

Check Latest Price

Sold By Price
Amazon.com – Seller
eBay – poolsupplyworld
InTheSwim Pool Supplies
Leslie’s Pool Supplies

Product Details

Specifications

Details
Product Dimensions 9.1 x 2.5 x 1.9 inches

Reviews From Real Customers

Mark H
Thomas M

4. AquaBond Underwater Pool Repair Epoxy Kit Gray DMK-5200

AquaBond Underwater Pool Repair Epoxy Kit Gray DMK-5200

  • Make long-lasting, professional repairs in and around swimming pools, spas and fountains.
  • No need to drain the pool! Specially formulated epoxy adhesive mixes, applies and cures underwater – or above!
  • Bonds a wide range of materials including PVC, metal, fiberglass, ceramic, vinyl, concrete and wood.
  • Gray color, paintable and sandable, cures in 4 hours whether exposed to air or submerged in water.

Check Latest Price

Sold By Price
Amazon.com – Seller
BestPoolShop.com
AZ Pool Shop

Product Details

Specifications

Details
Assembled Product Weight 1.22 lb
Assembled Product Dimensions (L x W x H) 10.00 x 6.00 x 6.00 Inches

Reviews From Real Customers

hyphenco
Doug S.
forshurztommy

5. 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
artiejohnh

6. 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

7. 3M 8027 Marine Silicone Sealant, White – 10 oz tube

3M 8027 Marine Silicone Sealant, White - 10 oz tube

  • DEVELOPED SPECIFICALLY AS A MARINE SEALANT – Stays tough and flexible for a wide range of uses above the waterline
  • VERY VERSATILE – Works on metal, glass, paint, fiberglass and more
  • EASY TO USE – Applies right from the container with no mixing required
  • HELPS KEEP WATERCRAFT LOOKING SHARP – Won’t turn yellow over time
  • EASY TO USE – Requires no mixing and curing in as little as 24 hours so you can get back out on the water faster

Check Latest Price

Sold By Price
Amazon.com
eBay
Walmart
Home Depot

Product Details

Specifications

Details
Brand 3M
Color White
Chemical Base Resin
Cure Time 24 hr
Product Form Paste

Reviews From Real Customers

Jpage
CHACHA
Mark the sunburnt one

8. Boss 802 2-Pack Clear Pro Grade Silicone Sealant for Pool, Spa, Household – 2 x 280ML. Tubes

Boss 802 2-Pack Clear Pro Grade Silicone Sealant for Pool, Spa, Household - 2 x 280ML. Tubes

  • Multi-Purpose Clear Silicone – Made in USA.
  • Tack free in 15 minutes – Cures fully in 24 hours.
  • Professional Grade for spa, pool, and general use.
  • Two Large 280 ml. tubes.
  • STOCK UP & SAVE!!

Check Latest Price

Sold By Price
Amazon.com – Seller
eBay

Product Details

Specifications

Details
Package Dimensions 9.5 x 3.8 x 1.8 inches
Is Discontinued By Manufacturer No
Item Package Quantity 2

Reviews From Real Customers

George J. N.
great2know
Proud G.

9. Gorilla All-Purpose 100% Silicone Sealant, Clear – 10 fl oz tube

Gorilla All-Purpose 100% Silicone Sealant, Clear - 10 fl oz tube

  • 10 oz

Check Latest Price

Sold By Price
Amazon.com
Walmart
Gemplers
Valu Home Centers

Product Details

Specifications

Details
Brand Gorilla Glue
Color Clear
Chemical Base Silicone
Cure Time 30 min
Product Form Paste

Reviews From Real Customers

SunnyBunny
Anna S.
Looking 7.

10. Atlas 530317 Pool Putty Black

Atlas 530317 Pool Putty Black

  • Stops leaks, fills cracks, restores chipped tile.
  • Will cure under water.
  • Will not yellow or shrink Package Dimensions: 6.

Check Latest Price

Sold By Price
Amazon.com – Seller
eBay
Walmart
DK Hardware

Product Details

Specifications

Details
Product Dimensions 1 x 3 x 6 inches
Is Discontinued By Manufacturer No

Reviews From Real Customers

Dad
Mac
EW

11. Anderson FS4B 4oz Flexible Sealer Tube – Blue

Anderson FS4B 4oz Flexible Sealer Tube - Blue

  • Seals cracks in PVC, fiberglass, ceramics, plaster and gunite.
  • Make vinyl repairs above or below water, with or without a patch.
  • Seal threads, even in situations with temperature related expansion and contraction.

Check Latest Price

Sold By Price
Amazon
eBay – poolsupplyworld
Walmart
InTheSwim Pool Supplies

Product Details

Specifications

Details
Product Dimensions 5.91 x 1.57 x 1.57 inches
Is Discontinued By Manufacturer No

Reviews From Real Customers

Paul T.
itzik k.
Ronald N.

12. AquaBond DMK-5000 50ml Underwater Repair Starter Kit

AquaBond DMK-5000 50ml Underwater Repair Starter Kit

Check Latest Price

Sold By Price
Amazon
Your Pool HQ
DK Hardware

Product Details

13. Gold Label Pond Sealant/Clear Caulk

Gold Label Pond Sealant/Clear Caulk

  • Unique product that seals all types of leaks and cracks using moisture as a curing agent so no need to drain the water.
  • Suitable for all types of application Rubber/PVC/EPDM/Plastic/Glass.
  • Ensure surface is clean before application.

Check Latest Price

Sold By Price
Amazon
eBay
Walmart – AquariumH2o & PondH2o
AquariumH2o

Product Details

Specifications

Details
Water Type Brackish,Fresh,Pond

Reviews From Real Customers

nevereverdull
Jeff in Seattle
Reviewed by Pond Planet Ltd customer

14. 3M Marine Grade Silicone Sealant – Clear – 3oz

3M Marine Grade Silicone Sealant - Clear - 3oz

  • 3M Marine Grade Silicone Sealant is a one-part, general all-purpose polyurethane that chemically reacts with moisture.
  • Flexible, bonds with good adhesion to wood, fiberglass, gelcoat, plastics and metals.
  • Forms watertight, weather-resistant seals on joints and boat hardware above the waterline Only.
  • This product is approximately half the strength of 3M Marine Adhesive Sealant 5200.
  • Allows for disassembly of parts.

Check Latest Price

Sold By Price
Amazon
Walmart
West Marine
Digi-Key

Product Details

Specifications

Details
Brand 3M
Color Clear
Chemical Base Resin
Cure Time 24 hr
Product Form Paste

Reviews From Real Customers

Monarchy

15. Underwater Magic UWM-09C 290ml/9.8oz Tube 12ct Black Sealant

Underwater Magic UWM-09C 290ml/9.8oz Tube 12ct Black Sealant

  • No complicated mixing.
  • No clouds in your pool.
  • Use it while your pool is in use.
  • No silicone contamination.
  • Long lasting.

Check Latest Price

Sold By Price
Amazon
Wild West Pool Supplies

Product Details

16. Sika 300ml 291 iCure Multipurpose Marine Sealant Clear 408851

Sika 300ml 291 iCure Multipurpose Marine Sealant Clear 408851

  • Low odour, Non-corrosive, solvent free and very low VOC
  • Bonds well to a wide variety of marine substrates
  • Highly elastic and can be painted over
  • Low isocyanate content
  • Wheelmark approved

Check Latest Price

Sold By Price
Amazon
Waveinn.com

Product Details

Reviews From Real Customers

birdmanonthebank
robthedesigner
garyw536

17. Underwater Pool Repair Kit | Vinyl Glue | Blue and White Pool Liner Patches

Underwater Pool Repair Kit | Vinyl Glue | Blue and White Pool Liner Patches

Check Latest Price

Sold By Price
Amazon
eBay – outdoorsupplyinc
Walmart – Outdoor Supply, Inc.

Product Details

Specifications

Details
Maximum Weight 0 lb

Reviews From Real Customers

4accord
marantonmar
Adelaida

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

Marlig Fix A Leak 32oz Pool and Spa Leak Stop

Check Latest Price

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

19. Leakmaster Pool Repair Putty PP701

Leakmaster Pool Repair Putty PP701

  • Excellent Quality.
  • Great Gift Idea.
  • Satisfaction Ensured.
  • Produced with the highest grade materials.

Check Latest Price

Sold By Price
Amazon
eBay
Walmart
InTheSwim Pool Supplies

Product Details

Specifications

Details
Weight 16.01 lb

Reviews From Real Customers

fred f.
Jammer
Billey M.

20. 10.3 oz Silicone Adhesive Clear 80200B

10.3 oz Silicone Adhesive Clear 80200B

  • All natural Enzyme
  • No more itching, No more rashes, No more scum lines
  • Reduces and/or eliminates the majority of your spa care chemical regimen including pH up, pH down, clarifiers and filter cleaning products
  • Easier on your spa equipment than Bromine

Check Latest Price

Sold By Price
eBay
Walmart
SpaDepot.com
Big Frog Supply

Product Details

Specifications

Details
Package Dimensions 12.68 x 2.44 x 1.97 inches
Is Discontinued By Manufacturer No

Reviews From Real Customers

tubadave
Fish
master chief

Conclusion

The best sealant for pools is one that is durable and can withstand the constant exposure to water. There are many sealants on the market that claim to be the best, but it is important to read the reviews before purchasing one.

Many pool owners have had success with an underwater sealant that is made specifically for pools. This type of sealant will fill in any cracks or gaps in the pool and will prevent water from seeping through.

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