10 bestRadiator Leak Sealerof January 2026
112M consumers helped this year.
16% off
1
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
9.9
2
K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant
K-Seal
9.8
3
K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant
K-Seal
9.7
4
LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red
Liqui Moly
9.5
5
Holts Sealit Leak Repair 250ml, (Packing May Vary)
Holts
9.3
Other
K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators
ARZER Car Radiator & Hose Stop Leak Repair Additive - Anti Corrosion 250ml - Repairs Weld Cooling System Rads
HOCHSTE Holts Radweld 250ml - Radiator & Cooling System Leak Repair, Stops Leaks Fast, Prevents Future Damage Blue - 2 Pack 500ml
ERRECOM Bluet, Car Radiator Stop Leak, 250 mL bottle
11% off
6
LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956
Liqui Moly
9.0
7
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
8.8
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
8.5
9
Motul RADIATOR LEAK SEALER
Motul
8.2
10
Holts LOYRW2R Radweld 250ml
Holts
7.9
Related Reviews You Might Like
Best Reviews Guide Newsletter
Get exclusive articles, recommendations, shopping tips, and sales alerts
Sign up for our newsletter to receive weekly recommendations about seasonal and trendy products
Thank you for subscribing!
By submitting your email address you agree to our Terms and Conditions and Privacy Policy