10 bestRadiator Leak Sealerof October 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
4
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
9.0
5
Holts LOYRW2R Radweld 250ml
Holts
8.7
OtherUp to 18% off
ERRECOM Bluet, Car Radiator Stop Leak, 250 mL bottle
K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators
Motul RADIATOR LEAK SEALER
HOCHSTE Holts Radweld 250ml - Radiator & Cooling System Leak Repair, Stops Leaks Fast, Prevents Future Damage Blue - 2 Pack 500ml
16% off
6
LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956
Liqui Moly
8.4
6% off
7
ARZER Car Radiator & Hose Stop Leak Repair Additive - Anti Corrosion 250ml - Repairs Weld Cooling System Rads
ARZER
8.2
8
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
HOCHSTE
7.9
9
LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red
Liqui Moly
7.6
10
Holts Sealit Leak Repair 250ml, (Packing May Vary)
Holts
7.3
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