10 bestRadiator Leak Sealerof November 2025
112M consumers helped this year.
1
K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant
K-Seal
9.8
2
Holts Radweld Plus Coolant Leak Repair, Total Coolant Leak Repair, Industry Leading Car Radiator Leak Sealant, Easy To Use, Seal Engine Block, Cylinder Head, Hoses & More, Suitable For All Cars, 250ml
Holts
9.6
3
K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant
K-Seal
9.3
11% off
4
LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956
Liqui Moly
9.0
5
Holts Sealit Leak Repair 250ml, (Packing May Vary)
Holts
8.7
OtherUp to 3% off
LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red
Motul RADIATOR LEAK SEALER
Holts SEALit Leak Repair 250ml - Professional Radiator & Coolant Leak Sealer for Engine, Cylinder Head, Head Gasket, Freeze Plugs, Water Pump Gaskets, Radiators Red - 1 Pack 250ml
Visbella Radiator Stop Leak Sealer Conditioner Radiator Repair Kit Car Heater Core, Freeze Plugs, Cooling System & Radiator Repair
16% off
6
Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml
Wynn's
8.4
7
Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads
Generic
8.1
8
Holts LOYRW2R Radweld 250ml
Holts
7.8
9
HOCHSTE Holts Radweld 250ml - Radiator & Cooling System Leak Repair, Stops Leaks Fast, Prevents Future Damage Blue - 2 Pack 500ml
HOCHSTE
7.5
32% off
10
K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators
Generic
7.2
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