10 bestRadiator Stop Leaksof September 2025
112M consumers helped this year.
1
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal
9.8
2
Bar's Leaks PLT11 Pelletized Radiator Stop Leak - 11 oz.
Bar's Leaks
9.6
3
K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal
9.5
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
9.3
5
Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132
Liqui Moly
9.1
5% off
6
Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.
Bar's Leaks
8.8
7
J-B Weld 2120 Radiator and Plastic Repair Kit
JB Weld
8.5
22% off
8
Bar's Leaks 1196 Grey Radiator Stop Leak - 11 oz.
Bar's Leaks
8.2
9
Bar's Leaks 1194 Grey Radiator Stop Leak - 6 oz.
Bar's Leaks
7.9
10
AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card - 20 g
AlumAseal
7.6
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