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10 bestHeater Core Leak Sealantof June 2025

112M consumers helped this year.

1

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

9.8

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2

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

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

9.3

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10% off

4

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

Wynn's

9.1

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5

Heat Resistant Sealant 1300 C - 310ml
Heat Resistant Sealant 1300 C - 310ml

VITCAS

8.8

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Power Maxed - Coolant Seal Leak Repair - 250ml

Power Maxed - Coolant Seal Leak Repair - 250ml

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Fernox 56603 Leak Sealer

Fernox 56603 Leak Sealer

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BLACK HIGH TEMPERATURE SILICONE ADHESIVE SEALANT 20ml HEAT RESISTANT 300'C new

BLACK HIGH TEMPERATURE SILICONE ADHESIVE SEALANT 20ml HEAT RESISTANT 300'C new

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FERNOX Central Heating Leak Sealer F4 Express 400ml - Fast Results - 30 sec - (Replacement 58232)

FERNOX Central Heating Leak Sealer F4 Express 400ml - Fast Results - 30 sec - (Replacement 58232)

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6

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

8.5

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12% off

7

Holts Sealit Leak Repair 250ml, (Packing May Vary)
Holts Sealit Leak Repair 250ml, (Packing May Vary)

Holts

8.2

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8

Fernox 61016 50ml LS-X External Leak Sealer
Fernox 61016 50ml LS-X External Leak Sealer

Fernox

7.9

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9

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

7.6

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5% off

10

Holts LOYRW2R Radweld 250ml
Holts LOYRW2R Radweld 250ml

Holts

7.4

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