The Best Radiator Sealant of 2023

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We ranked and reviewed the top 10 Best Radiator Sealant in 2023. Read more How we ranked

Emily Sloyan
Sep 22, 2023 7:40 AM

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BlueDevil Radiator & Block Sealer

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SCORE
7.1
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
BlueDevil Products

Features

Permanent repair for radiator and block leaks.

Works effectively on plastic, aluminum and/or metal radiators

Contains no solids or fibrous materials.

Safe and Easy to use.

Guaranteed

PROS

CONS

Bar's Leaks 1194 Radiator Stop Leak Concentrate - 6 oz.

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SCORE
9.0
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
Bar's Leaks

Features

Product type :AUTO ACCESSORY

Package dimensions :4.064 cm L x6.096 cm W x12.446 cm H

country of origin :United States

package weight :0.81lbs

PROS

CONS

Prestone AS145 Stop Leak Repair for Radiators, Heater Cores, and Hoses, 11 oz, 1 Pack

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SCORE
7.6
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
Prestone

Features

Patented formula quickly stops leaks in radiators, water pumps, and heater cores

Boosts corrosion inhibitors to protect against pitting and corrosion, which cause radiator leaks

Combination of natural and synthetic components provides the ability to seal leaks up to 0.020" x 0.5"

Seals even large leaks without interfering with the flow through the radiator or heater core

Stops the leak as well as the corrosive condition that causes it

PROS

CONS

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

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SCORE
7.3
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
Bar's Leaks

Features

Seals leaks

Conditions cooling system

Inhibits rust and corrosion

Lubricates water pump seals

Helps control electrolysis

PROS

CONS

Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz.

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SCORE
8.6
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
Bar's Leaks

Features

Seals leaks

Conditions cooling system

Inhibits rust and corrosion

Lubricates water pump seals

Helps control electrolysis

PROS

CONS

J-B Weld 2120 Radiator and Plastic Repair Kit

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SCORE
7.1
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
J-B Weld

Features

RADIATORWELD: Our radiator and plastic tank repair kit has all you need for making professional quality, permanent repairs with state of the art components and easy to follow instructions.

COUNT ON US: For more than 40 years, our products have earned a loyal following from people who take pride in their work. With each product we innovate, we continue to provide the world's strongest bond for your projects.

SIMPLE TO USE: No removal of tank or radiator is required to stop leaks. Easily fix holes up to 3/8" diam. or cracks up to 4" long. Includes epoxy putty, fiberglass cloth, sandpaper, and applicator.

VERSATILE & DEPENDABLE: Great for radiators, washer fluid tanks, storage tanks, water tanks, plastics, composites, PVC and more. Professionals, mechanics and avid DIYers know J-B gets the job done.

NO PROJECT TOO BIG OR TOO SMALL: We have all the products you need to get the job done right. JB Weld always delivers the legendary performance of the World's Strongest Bond.

PROS

CONS

AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card - 20 g

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SCORE
8.2
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
Alumaseal

Features

Stops leaks safely, quickly and easily

Safe and effective for all metal, plastic and rubber cooling system parts

Will not clog cooling systems

Compatible with all antifreeze and coolants

Stop leak tube treats cooling systems up to 22 quarts (21 liters)

PROS

CONS

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

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SCORE
8.3
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
Bar's Leaks

Features

Seals larger leaks seals

Repairs heater core leaks

Repairs freeze plug leaks

Repairs blown head gaskets

Repairs blocks

PROS

CONS

BlueDevil 32oz Head Gasket Sealer w/Radiator Flush

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SCORE
8.5
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
N/A

Features

Permanently Seals Blown Head Gaskets

Permanently Seals Leaking Radiators

Permanently Seals Warped & Cracked Heads

Permanently Seals Leaking Heater Cores

Includes 32oz Head Gasket sealer and 32 oz Flush

PROS

CONS

Super Glue Pro Seal N62020 Instant Gas Tank and Radiator Repair

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SCORE
7.2
KT Score

KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.
Brand
Super Glue

Features

Instant Gas Tank and Radiator Repair

0.7-Ounce strip

Easy to use putty

Permanently seals cracks and split seams

Hardens like steel

PROS

CONS

Last update on 2023-09-22 / Prices / Affiliate links / Images, and Product Highlights from Amazon Product Advertising API

Editor's Notes

We ranked and reviewed the top 10 Best Radiator Sealant in 2023. With the support of 56,113 customer's reviews, we hope that this article can give you the most realistic view of these products. The list below contains some main brands as bluedevil-products, bars-leaks, prestone, j-b-weld, alumaseal, na, super-glue.