10 bestCoolant Sealantof November 2025
112M consumers helped this year.
40% off
1
Prestone PAFR0035B Coolant Antifreeze for All Vehicles 10 year 300,000 miles Corrosion Protection, Ready to Use, 1 Litre
Prestone
9.9
2
K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant
K-Seal
9.8
10% off
3
Wynn's Engine Oil Stop Leak Sealer Treatment Additive For All Engine Types 325ml & Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml
Wynn's
9.6
9% off
4
MANNOL 5L Coolant Antifreeze G12+ RED Ready Mixed -30°C / +125 German Hi Spec
9.5
5
Wynn's Black Instant Gasket Maker Silicone High Temperature RTV Sealant 200ml
Wynn's
9.2
OtherUp to 10% off
AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak
Visbella Neutral RTV 100% Gasket Maker Oil and Water Resistance Anti-Freeze Remain Flexible Ultra 3 oz. High Temperature 600°F Sealant Tube
Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml
Plextone Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF
6
Holts HAFR0008B Antifreeze Coolant for Car Mercedes & BMW, 10-year 300k mile long life, protection to -37°C, Includes Spout, Blue, 5 Litre
Holts
9.0
7
K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant
K-Seal
8.8
8
AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging
AMK
8.5
9
Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads
ARZER
8.2
14% off
10
Prestone LOYAF2100LGBA Coolant/Antifreeze - Ready to Use 1lt
Prestone
7.9
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