10 bestRadiator Leak Sealerof May 2025
112M consumers helped this year.
15% off
1
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal
9.8
2
K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal
9.6
3
Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.
Bar's Leaks
9.3
4
K-SEAL Coolant Leak Repair, ST9501 472ml Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, Freeze Plug - Pour and Go - Designed for Canadian Market
K-Seal
9.0
5
Bar's 1196-6PK Radiator Stop Leak 6/11Oz
Bar's Leaks
8.7
6
Bar's Leaks PLT11 Pelletized Radiator Stop Leak - 11 oz.
Bar's Leaks
8.4
7
Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132
Liqui Moly
8.1
8
Bar's Leaks 1194 Grey Radiator Stop Leak - 6 oz.
Bar's Leaks
7.9
9
Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams
Bar's Leaks
7.6
10
Prestone AS145 Radiator Sealer Stop Leak - 11 oz.
Prestone
7.3
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