Top 10 Radiator Stop Leak – Fuel Leak Detectors

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1. Bar's Leaks

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

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Bar's Leaks #ad - Bar's leaks liquid aluminum stop leak seals radiator leaks. Seals freeze plug leaks. Seals radiator leaks. Repairs gasket leaks. Special shipping information: This item cannot be returned and has additional shipping restrictions. Seals freeze plug leaks. Lowers water temperature. Repairs gasket leaks and heater core leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height7.4 Inches
Length2.6 Inches
Weight1.2 Pounds
Width2.6 Inches
Part Number1186
Model1186
Warranty1 year manufacturer

2. K-Seal

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Trade Trusted-Stop Leak, ST5501 8oz, Water Pump Casing, Block, K-SEAL Coolant Leak Repair, Multi-Purpose Formula Stops Leaks in the Radiator, Heater Core, Head Gasket, and Freeze Plug, Pour and Go

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K-Seal #ad - Check the technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold worldwide! Save time/money. Seals cracks and stops leaks: a diy alternative to costly repairs, freeze plug, our coolant leak fix permanently seals cracks and holes! It quickly repairs your leaking radiator, heater core and water pump casing with no adverse impact on efficiency.

Customer support: if k-seal engine coolant leak stop doesn’t seal, the system might be over-pressurized. Us bestseller. The only car radiator and gasket sealant university tested to meet ASTM D3147. Pour and go: our cooling system sealer is easy to use: just shake the bottle, it mixes with all types of antifreeze, add to your radiator/overflow and run the engine! Unlike some traditional products, absolutely no draining or flushing required.

Scientifically tested: safe and effective, the repair withstands the high pressure of the combustion chamber, our cracked block repair can seal leaks up to 1/32 of an inch! Once cured, all without failing or clogging the cooling system. Repairs in minutes: formulated to permanently weld radiators, including hard plastic aluminum heads and blocks in old and new cars.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height6 Inches
Length7.87 Inches
Weight0.6 Pounds
Width2 Inches
Part NumberST5501
ModelST5501
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

3. Bar's Leaks

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

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Bar's Leaks #ad - Seals leaks. Lubricates water pump seals. Conditions cooling system. Inhibits rust and corrosion. Helps control electrolysis.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height6 Inches
Length3 Inches
Weight0.85 Pounds
Width3 Inches
Part NumberPLT11
ModelPLT11

4. Bar's Leaks

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

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Bar's Leaks #ad - Conditions cooling system. Inhibits rust and corrosion. Lubricates water pump seals. Helps control electrolysis. Seals leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height0.8 Inches
Length7.5 Inches
Weight0.2 Pounds
Width5 Inches
Part NumberHDC
ModelHDC
WarrantyManufacturer Warranty

5. Bar's Leaks

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

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Bar's Leaks #ad - Works with all types and colors of anti-freeze coolant. Auto & truck Maintenance. Stops and seals coolant leaks. One bottle treats up to 4 gallons. Manufacturer: bAR'S LEAKS. Country of manufacture: United States.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height5 Inches
Length1.6 Inches
Weight0.5 Pounds
Width2.4 Inches
Part Number1196
Model1196
WarrantyNo

6. Bar's Leaks

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

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Bar's Leaks #ad - Seals larger leaks seals. Repairs heater core leaks. Repairs freeze plug leaks. Repairs blocks. Repairs blown head gaskets.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.6 Inches
Length7.5 Inches
Weight1.3 Pounds
Width2.6 Inches
Part Number1109
Model1109

7. Bar's Leaks

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Bar's Leaks 1194 Radiator Stop Leak Concentrate, 6 oz.

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Bar's Leaks #ad - One bottle treats up to 3 gallons. Works with all types and colors of anti-freeze coolant. Stops and seals coolant leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height6.5 Inches
Length1.8 Inches
Weight0 Pounds
Width3 Inches
Part Number1194
Model1194
WarrantyNo

8. J-B Weld

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J-B Weld DS-114 PERM-O-Seal Radiator Stop Leak, 0.7 oz.

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J-B Weld #ad - It will not clog or harm your cooling system. Jb weld perm o seal : is a specially formulated non-toxic compound ground to a very fine particle size to quickly mix and flow into all areas of the cooling system to find and seal leaks.

Our heavy duty adhesives repair & restore it right the first time. Money saving repair solution: The powered concentrate allows for an economical repair as compared to liquid based alternatives that use similar technology. What the pros use: mechanics, repair pros, and any avid DIYer knows our products bond strong to a variety of surfaces in even the toughest environments; and they have always been made in the USA.

Do it yourself: big or small, you can diy it with j-b. Durable fast fix: the special compound will quickly seal leaks and will also act as a rust inhibitor and lubricant to internal cooling system parts. Jb weld delivers the legendary performance of the World's Strongest Bond.
BrandJ-B Weld #ad
ManufacturerJ-B WELD #ad
Height0 Inches
Length0 Inches
Weight0.1 Pounds
Width0 Inches
Part NumberDS114
ModelDS-114
Warranty1 year manufacturer

9. Prestone

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11 oz., Prestone AS145 Radiator Sealer Stop Leak

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Prestone #ad - Seals even large leaks without interfering with the flow through the radiator or heater core. Combination of natural and synthetic components provides the ability to seal leaks up to 0020" x 05". Boosts corrosion inhibitors to protect against pitting and corrosion, which cause radiator leaks. Stops the leak as well as the corrosive condition that causes it. Patented formula quickly stops leaks in radiators, water pumps, and heater cores.
BrandPrestone #ad
ManufacturerPrestone #ad
Height5.64 Inches
Length1.91 Inches
Weight0.82 Pounds
Width3.04 Inches
Part NumberAS145
ModelAS145

10. ATP Automotive

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

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ATP Automotive #ad - Rejuivinates all rubber seals & gaskets in engines, power steering, transmissions, differentials and hydraulic systems. Does not contain petroleum distillates, will not over-swell or breakdown seals. Compatible with conventional and synthetic oils, gear oil, ATF, power steering fluids and hydraulic oil. 8oz bottle will treat a 6 quart capacity, adjust accordingly. Professional strength fast acting resealer, stops leaks fast.
BrandATP Automotive #ad
ManufacturerATP #ad
Height4 Inches
Length7 Inches
Weight0.11 Pounds
Width4.5 Inches
Part NumberAT-205
ModelAT-205
WarrantyMoney Back Guarantee