10 bestRadiator Sealantof November 2025
112M consumers helped this year.
12% off
1
Sikaflex-221, White, Multi-Purpose Industrial Grade Polyurethane Sealant & Adhesive, Weather Resistant Sealant. Ideal for Caravans & Motorhomes 300 mL (10.1 US fl. oz)
SIKA
10.0
2
Liquid Rubber RV Lap Sealant, White, 2 Pack
Liquid Rubber
10.0
3
Permatex 59203 Black RTV Silicone Adhesive Sealant 16BR, 80ml
Permatex
9.8
4
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
9.7
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
9.5
OtherUp to 13% off
CLARK'S Soapstone and Concrete Sealer - Natural Beeswax and Carnauba Wax Blend - Ideal for Countertops and Slate Surfaces - Concrete Countertop Wax - Carnauba Wax Food Grade - Large - 32 oz
SIKA - High-performance elastomeric sealant for joints - Sikaflex 1A - White - for small joints and fillets - Multi-purpose - Single Component - 300 mL
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair
BlueDevil Pour-N-Go Head Gasket Sealer - 16 Ounce (00209)
6
Permatex 59103 Clear RTV Silicone Adhesive Sealant 66BR, 80mL
Permatex
9.3
30% off
7
Permatex 59234 High Temperature 592 Thread Sealant, 50mL
Permatex
9.1
8
J-B Weld 31914 Red High Temperature RTV Silicone Gasket Maker and Sealant - 10.3 oz.
JB Weld
8.9
9
K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal
8.6
10
Plastic Radiator Tank Repair Kit
Polyvance
8.4
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