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10 bestCoolant Sealantof November 2025

112M consumers helped this year.

10% off

1

EPAuto Spill Proof Radiator Coolant Filling Funnel Kit
EPAuto Spill Proof Radiator Coolant Filling Funnel Kit

EPAUTO

9.8

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2

Liquid Rubber RV Lap Sealant, White, 4 Pack
Liquid Rubber RV Lap Sealant, White, 4 Pack

Liquid Rubber

9.6

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3

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 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

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4

K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair

K-Seal

9.0

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5

SILCA Ultimate Tubeless Tire Sealant W/FIBERFOAM | Long Lasting, Fast Sealing Bike Tire Sealant | Tubeless Sealant - MTB, Road, Gravel Bicycle Tires | Tire Sealant Bicycle (32oz Sealant with Carbon)
SILCA Ultimate Tubeless Tire Sealant W/FIBERFOAM | Long Lasting, Fast Sealing Bike Tire Sealant | Tubeless Sealant - MTB, Road, Gravel Bicycle Tires | Tire Sealant Bicycle (32oz Sealant with Carbon)

SILCA

8.7

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Related productsUp to 46% off

Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams

Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams

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Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.

Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.

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Permatex 22071 Water Pump and Thermostat RTV Silicone Gasket, 0.5 oz.

Permatex 22071 Water Pump and Thermostat RTV Silicone Gasket, 0.5 oz.

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170g RTV Silicone Gasket Maker, Black Silicone Sealant Shockproof and Leakproof, High Temperature Resistant, RTV Sealant Can be Used in Engines, Transmissions, Superchargers and All Types of Gaskets

170g RTV Silicone Gasket Maker, Black Silicone Sealant Shockproof and Leakproof, High Temperature Resistant, RTV Sealant Can be Used in Engines, Transmissions, Superchargers and All Types of Gaskets

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6

Irontite All Weather Seal, Blue, 16 oz (468-9130-16)
Irontite All Weather Seal, Blue, 16 oz (468-9130-16)

Irontite

8.4

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7

K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair
K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

K-Seal

8.1

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8

FrostyCool R134a and R12 Replacement A/C Refrigerant Deluxe Recharge Mobile Sealer and Stop Leak Kit
FrostyCool R134a and R12 Replacement A/C Refrigerant Deluxe Recharge Mobile Sealer and Stop Leak Kit

FrostyCool

7.8

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9

Permatex 59103 Clear RTV Silicone Adhesive Sealant 66BR, 80mL
Permatex 59103 Clear RTV Silicone Adhesive Sealant 66BR, 80mL

Permatex

7.5

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10

SIKA - High-Performance elastomeric Polyurethane sealant - Sikaflex 1A - Limestone - Multi-Purpose - Seal and Weatherproof Joints - One-Component - 300 mL
SIKA - High-Performance elastomeric Polyurethane sealant - Sikaflex 1A - Limestone - Multi-Purpose - Seal and Weatherproof Joints - One-Component - 300 mL

SIKA

7.3

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