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10 bestRadiator Sealantof November 2025

112M consumers helped this year.

1

POR-15 49216 U.S. Standard Tank Sealer - 8 fl. oz.

POR-15 49216 U.S. Standard Tank Sealer - 8 fl. oz.

POR-15 49216 U.S. Standard Tank Sealer - 8 fl. oz.

POR-15

9.9

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2

K-SEAL Permanent COOLANT Leak Repair Liquid 236ml - Stop Radiator Leak, Head Gasket Repair,Block/Head Sealer-No Draining/No Flushing,for All Cars, Light Trucks, Heavy Trucks & Buses

K-SEAL Permanent COOLANT Leak Repair Liquid 236ml - Stop Radiator Leak, Head Gasket Repair,Block/Head Sealer-No Draining/No Flushing,for All Cars, Light Trucks, Heavy Trucks & Buses

K-SEAL Permanent COOLANT Leak Repair Liquid 236ml - Stop Radiator Leak, Head Gasket Repair,Block/Head Sealer-No Draining/No Flushing,for All Cars, Light Trucks, Heavy Trucks & Buses

K-Seal

9.8

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3

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 ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

K-Seal

9.7

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4

Liqui Moly Ready Mix Radiator Coolant RAF12+ (1 Litre)

Liqui Moly Ready Mix Radiator Coolant RAF12+ (1 Litre)

Liqui Moly Ready Mix Radiator Coolant RAF12+ (1 Litre)

Liqui Moly

9.5

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5

Liqui Moly Radiator Cleaner (300ml)

Liqui Moly Radiator Cleaner (300ml)

Liqui Moly Radiator Cleaner (300ml)

Liqui Moly

9.4

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6

SIKA - Pack of 2 Universal silicone sealant - Sikasil Multiplus-T - Sanitary sealant - Anti-mould - anti-fungicide - For kitchens and bathroom - White - 120ml

SIKA - Pack of 2 Universal silicone sealant - Sikasil Multiplus-T - Sanitary sealant - Anti-mould - anti-fungicide - For kitchens and bathroom - White - 120ml

SIKA - Pack of 2 Universal silicone sealant - Sikasil Multiplus-T - Sanitary sealant - Anti-mould - anti-fungicide - For kitchens and bathroom - White - 120ml

SIKA

9.2

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7

SIKA - Sealant glue - Sikaflex-291i - Black - Multifunctional Adhesive Sealant For Marine Applications - Highly Elastic - Interior Use - For Boats - 300ml

SIKA - Sealant glue - Sikaflex-291i - Black - Multifunctional Adhesive Sealant For Marine Applications - Highly Elastic - Interior Use - For Boats - 300ml

SIKA - Sealant glue - Sikaflex-291i - Black - Multifunctional Adhesive Sealant For Marine Applications - Highly Elastic - Interior Use - For Boats - 300ml

SIKA

8.9

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8

Permatex 81158 Black Silicone Adhesive Sealant, 3 oz. Tube

Permatex 81158 Black Silicone Adhesive Sealant, 3 oz. Tube

Permatex 81158 Black Silicone Adhesive Sealant, 3 oz. Tube

Permatex

8.7

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9

Bar's Products Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz

Bar's Products Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz

Bar's Products Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz

Bar's Leaks

8.5

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10

SIKA - Sikaflex 127 - Concrete Grey - Multipurpose sealant and adhesive based on hybrid polyurethane - Ready to use - Easy to apply - Interior and exterior use, 600ml

SIKA - Sikaflex 127 - Concrete Grey - Multipurpose sealant and adhesive based on hybrid polyurethane - Ready to use - Easy to apply - Interior and exterior use, 600ml

SIKA - Sikaflex 127 - Concrete Grey - Multipurpose sealant and adhesive based on hybrid polyurethane - Ready to use - Easy to apply - Interior and exterior use, 600ml

SIKA

8.2

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