Top 10 Head Gasket Stop Leak Coolant – Cooling System Additives

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1. KALIMEX LTD

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K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair, Blue

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KALIMEX LTD #ad - Fixes cracks and leaks in radiator, head Gasket, Freeze Plugs, heater core, Cylinder Heads, Water Pump Casing And Engine Blocks. Mixes with All Antifreeze. Permanent coolant leak Repair - Just Shake, Pour And Go. No draining Or Flushing.
BrandKALIMEX LTD #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

2. K-Seal

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K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

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K-Seal #ad - If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully. Mixes with all antifreeze. Fixes cracks and leaks in radiator, head gasket, cylinder heads, freeze plugs, heater core, water pump casing and engine blocks. No draining or flushing. Permanent coolant leak repair - Just shake, pour and go.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height1.9 Inches
Length5.9 Inches
Weight1 Pounds
Width4.1 Inches
Part NumberST5516
ModelST5516
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

3. Bar's Leaks

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20 oz., Bar's Leaks 1100 Head Gasket Repair

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Bar's Leaks #ad - Repairs blown head gaskets. Head gasket sealant is not compatible with antifreeze and must only be added to the cooling system after ALL ANTIFREEZE has been flushed and removed. Included components: Unit, Instruction Guide. Seals cracked cylinder heads and blocks. Dual action 2 part formula — liquid ceramic: liquid penetrates large and small leaks to form a seal actually harder than the original head gasket — REINFORCED FIBERS: Fiber additives lock together with liquid to increase strength and promote a permanent seal. Stops block leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height8.3 Inches
Length1.8 Inches
Weight1.41 Pounds
Width3.4 Inches
Part Number1100
Model1100
Warranty1 year manufacturer

4. Bar's Leaks

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Bar's Leaks Block Seal Head Gasket Fix

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Bar's Leaks #ad - Stops block leaks. Seals cracked cylinder heads and blocks. Repairs blown head gaskets. Contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate gaps & cracks and harden to permanently stop leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.5 Inches
Length9.5 Inches
Weight1.5 Pounds
Width2.6 Inches
Part Number1111
Model1111
Warranty1 year manufacturer

5. ACDelco

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4 g Pack of 5, ACDelco GM Original Equipment 10-108 Cooling System Sealing Tabs

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ACDelco #ad - Designed for quick and easy application, assembly may be filled with oil or coolant immediately after applying sealant and torqueing the bolts. Engineered for use on a variety of engine components - effective on: oil pan, ladder frame, intake, manifold corners, t-joints, front and rear covers, manifold end seals, and cam covers. High viscosity product that cures when exposed to air.
BrandACDelco #ad
ManufacturerACDelco #ad
Height0 Inches
Length0 Inches
Width0 Inches
Part Number10-108
Model10-108
WarrantyNo Warranty

6. Bar's Leaks

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Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair

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Bar's Leaks #ad - Stops heater Core And Radiator Leaks. Repairs blown Head And Intake Gasket Leaks. Fixes leaking Freeze And Core Plugs. Seals cracked Cylinder Heads And Blocks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height3.22 Inches
Length9.78 Inches
Weight2.5 Pounds
Width3.22 Inches
Part NumberHG-1
ModelHG-1
WarrantyManufacturer Warranty

7. Bar's Leaks

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

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Bar's Leaks #ad - Seals radiator leaks. Repairs gasket leaks and heater core leaks. Bar's leaks liquid aluminum stop leak seals radiator leaks. Lowers water temperature. Seals freeze plug leaks. Special shipping information: This item cannot be returned and has additional shipping restrictions. Repairs gasket leaks. Seals freeze plug 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

8. KALIMEX LTD

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K-Seal ST3501 Pour and Go Permanent Head Gasket and Block Repair

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KALIMEX LTD #ad - Scientifically tested - k-seal is the only product to have been successfully tested by the equipment at Brighton University and classes as meeting the demands of ASTM D3147.

A permanent repair, guaranteed for the lifetime of the engine. Fixes blown head gaskets, cracked heads and blocks. If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully. Just pour & go – no need for expensive head Gasket Repairs - The Safe and Easy Way to Fix a Coolant Leak.
BrandKALIMEX LTD #ad
ManufacturerSolv-TecA #ad
Height8 Inches
Length2.5 Inches
Weight1 Pounds
Width2.5 Inches
Part NumberKSLST3501
ModelKSLST3501
WarrantyLifetime warranty does not cover abuse

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

10. Bar's Leaks

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

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Bar's Leaks #ad - Conditions cooling system. Lubricates water pump seals. Helps control electrolysis. Seals leaks. Inhibits rust and corrosion.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height0.8 Inches
Length7.5 Inches
Weight0.1 Pounds
Width5 Inches
Part NumberHDC
ModelHDC
WarrantyManufacturer Warranty