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Coolant Stop Leaks

10 Best Coolant Stop Leaks 2025 in the United States

Name: ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle
Brand: ATP Automotive
Price: 20.13 USD
Availability: InStock

From leading brands and best sellers available on the web.

Winner

ATP Automotive

ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

9.8

score

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K-Seal

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

9.6

score

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Bar's Leaks

Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz

9.3

score

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Liqui Moly

Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132

9.0

score

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K-Seal

K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

8.7

score

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K-Seal

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

8.4

score

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Bar's Leaks

Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.

8.1

score

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ACDelco

ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g

7.8

score

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Bar's Leaks

Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz.

7.5

score

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#10

Bar's Leaks

Bar's Leaks High Mileage Cooling System Repair

7.2

score

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10 Best Coolant Stop Leaks 2025 in the United States

ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz

Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132

K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.

ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g

Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz.

Bar's Leaks High Mileage Cooling System Repair

FAQ

Do coolant stop leaks really work?

Are coolant stop leak products safe to use?

What are the different types of coolant stop leaks available?

Can coolant stop leak be used in all types of vehicles?

What are the potential side effects of using coolant stop leak?

10 Best Coolant Stop Leaks 2025 in the United States

ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz

Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132

K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

Bar's Leaks Radiator Stop Leak Tablets, 1.76oz, Pack of 7

Prestone AS145 Stop Leak Repair for Radiators, Heater Cores, and Hoses, 11 oz., 1 Pack

Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams, Brown

Bar's Leaks 1196 Radiator Stop Leak - 11 oz. , Grey

BlueDevil Products 00205 Radiator & Block Sealer - 16 Ounce

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.

ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g

Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz.

Bar's Leaks High Mileage Cooling System Repair

Peak Coolants

Coolants

Radiator Stop Leaks

Coolant Leaks

Lisle Coolants

FAQ

Do coolant stop leaks really work?

Are coolant stop leak products safe to use?

What are the different types of coolant stop leaks available?

Can coolant stop leak be used in all types of vehicles?

What are the potential side effects of using coolant stop leak?