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10 bestRadiator Sealantof November 2025

112M consumers helped this year.

15% off

1

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Polar Specialist Coatings

9.8

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2

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal

9.6

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3

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

K-Seal

9.3

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4

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

Generic

9.0

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5

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

ARZER

8.8

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OtherRelated productsUp to 22% off

HOLTS Wondarweld - 500ml - WW500

HOLTS Wondarweld - 500ml - WW500

Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Fernox 61016 50ml LS-X External Leak Sealer

Fernox 61016 50ml LS-X External Leak Sealer

AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak

AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak

6

Holts 1831469 Radweld Plus New Formula 250ml

Holts 1831469 Radweld Plus New Formula 250ml

Holts 1831469 Radweld Plus New Formula 250ml

Holts

8.5

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7

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

Liqui Moly

8.2

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17% off

8

LOCTITE 577, Medium Strength Industrial Adhesive for Thread Sealing, Universal Liquid Adhesive for Pipes and Metal Threads, Chemically Resistant Thread Sealant, 50ml

LOCTITE 577, Medium Strength Industrial Adhesive for Thread Sealing, Universal Liquid Adhesive for Pipes and Metal Threads, Chemically Resistant Thread Sealant, 50ml

LOCTITE 577, Medium Strength Industrial Adhesive for Thread Sealing, Universal Liquid Adhesive for Pipes and Metal Threads, Chemically Resistant Thread Sealant, 50ml

Loctite

7.9

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9

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

Pro-Kleen

7.6

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10

Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g. Suitable for use on a wide range of materials including copper, stainless steel, and plastic.

Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g. Suitable for use on a wide range of materials including copper, stainless steel, and plastic.

Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g. Suitable for use on a wide range of materials including copper, stainless steel, and plastic.

Kudos-Trading

7.3

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