10 bestRadiator Sealerof November 2025
112M consumers helped this year.
1
Bar's Leaks 1111 Head Gasket Fix - 24 oz.
Bar's Leaks
9.8
2
POR-15 Fuel Tank Sealer - 16 oz Gray - Stops Rust, Corrosion, & Leaks | Seals Pinholes & Seams | Non-Porous, Flexible Film | Resistant to All Fuels, Alcohols, & Additives
POR-15
9.6
3
511 Impregnator Sealer
Miracle Sealants
9.5
4
J-B Weld 2110 Metal Fuel Tank Repair Kit , Gray
JB Weld
9.2
5
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
Other
Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams
Bar's Leaks 1196 Grey Radiator Stop Leak - 11 oz.
WEICON Gasket Maker | 310 ml | Special adhesion Sealent for car engine, motorbike, metal, glass, ceramic and more | Resistant to High-Temp, pressure, aging and UV | Permanently elastic (Red)
WEICON Black-Seal | Gasket Maker | Adhesion Sealent for car Engine, Motorbike, Metal, Glass, Ceramic and More | Resistant to High-Temp, Oil and Grease | Industrial Grade (310 ml)
6
J-B Weld KwikWeld Pro
JB Weld
8.8
7
K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal
8.5
8
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal
8.2
9
BlueDevil Pour-N-Go Head Gasket Sealer - 16 Ounce (00209)
BlueDevil Products
8.0
10
Irontite All Weather Seal, Blue, 16 oz (468-9130-16)
Irontite
7.7
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