10 bestRadiator Stop Leaksof November 2025
112M consumers helped this year.
1
K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal
9.9
2
Bar's Products Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz
Bar's Leaks
9.8
3
K-SEAL Permanent COOLANT Leak Repair Liquid 236ml - Stop Radiator Leak, Head Gasket Repair,Block/Head Sealer-No Draining/No Flushing,for All Cars, Light Trucks, Heavy Trucks & Buses
K-Seal
9.7
4
Liqui Moly Radiator Stop-Leak Oil (150 ml), Mix
Liqui Moly
9.4
5
Bar's Leaks PLT11 Pelletized Radiator Stop Leak - 11 oz.
Bar's Leaks
9.2
6
Bar's Leaks HDC Radiator Stop Leak Tablet - 60 grams
Bar's Leaks
8.9
7
GAT X ENERG G1 Radiator Sealant 300ml
ENERG THE BEST IN THE RACE
8.6
8
Bar's Products Leaks 1194 Grey Radiator Stop Leak - 6 oz
Bar's Leaks
8.3
9
Permatex 09116 Fuel Tank and Radiator Repair Kit
Permatex
8.0
10
Prestone AS145 Radiator Sealer Stop Leak - 11 oz.
Prestone
7.7
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