Top 8 Radiator Stop Leak Powder – Radiator Sealers

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1. Gunk


Gunk TITESEAL C551B Radiator Repair Powder, 2 oz.

Gunk #ad - Titeseal is a local family owned company based out of charlotte, nc. For more than 75 years, liquid wrench products, has earned the trust of hard-working tradesment and the active DIYer through consistent, developed by the people who use them, superior performance and a commitment to innovation. Titeseal.
BrandGunk #ad
ManufacturerBBI- Blumenthal Brands Integrated (Gunk and Liquid Wrench) #ad
Height1 Inches
Length1 Inches
Weight0.18 Pounds
Width1 Inches
Part NumberC551B

2. ACDelco


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

ACDelco #ad - Designed for quick and easy application, assembly may be filled with oil or coolant immediately after applying sealant and torqueing the bolts. High viscosity product that cures when exposed to air. Engineered for use on a variety of engine components - effective on: oil pan, ladder frame, front and rear covers, manifold corners, manifold end seals, t-joints, intake, and cam covers.
BrandACDelco #ad
ManufacturerACDelco #ad
Height0 Inches
Length0 Inches
Weight0.07 Pounds
Width0 Inches
Part Number10-108
WarrantyNo Warranty

3. Bar's Leaks


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

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

4. Alumaseal


AlumAseal ASLC16 Radiator Stop Leak and Conditioner Liquid, 16 Fl oz.

Alumaseal #ad - Stops leaks safely, quickly and easily. Guaranteed to work. Compatible with all antifreeze and coolants. Safe and effective for all metal, plastic and rubber cooling system parts. Lubricates water pump.
BrandAlumaseal #ad
ManufacturerGold Eagle Co. #ad
Height8.25 Inches
Length4 Inches
Weight1.18 Pounds
Width1.75 Inches
Part NumberASLC16
WarrantyLimited Waranty

5. Blue Magic


11.4 oz., Blue Magic 1008-24PK Liquid Glass Metallic Seal-Up®

Blue Magic #ad - For use in systems up to 6 gallons. Permanent cooling system sealer; Liquid glass and copper formula. Seals cracks permanently. Engine blocks, heaters, Radiators, heater Cores, Freeze Plugs. Seal withstands up to 2000 degrees Fahrenheit.
BrandBlue Magic #ad
ManufacturerBlack Magic #ad
Height5.79 Inches
Length2.28 Inches
Weight0.71 Pounds
Width2.28 Inches
Part Number1008



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

KALIMEX LTD #ad - No draining Or Flushing. Mixes with All Antifreeze. Permanent coolant leak Repair - Just Shake, Pour And Go. Fixes cracks and leaks in radiator, heater Core, Head Gasket, Cylinder Heads, freeze plugs, Water Pump Casing And Engine Blocks.
ManufacturerK-Seal #ad
Height6 Inches
Length7.87 Inches
Weight0.6 Pounds
Width2 Inches
Part NumberST5501
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

7. Bar's Leaks


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

Bar's Leaks #ad - Helps control electrolysis. Lubricates water pump seals. Conditions cooling system. Inhibits rust and corrosion. Seals leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height6 Inches
Length3 Inches
Weight0.69 Pounds
Width3 Inches
Part NumberPLT11
WarrantySee manufacturer

8. Bar's Leaks


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

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