Best Radiator Sealers (April 2024) - Rated by CherryPicks' Experts

At a Glance: Our Top Picks

Top 1

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

9.9
CPR Score
Top 2

J-B Weld 2120 Radiator Repair Kit

9.7
CPR Score
Top 3

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

9.6
CPR Score
Tips


Below is a list of the top 30 best Radiator Sealers. Our team has selected the top products by analyzing and evaluating 81 products of different Car Care brands, including Permatex, J-B Weld, CRC, Liqui Moly, Prestone, BlueDevil Products, Bar's Leaks, Vibrant Performance, Chrysler, Speedway Motors, Hapco Products Co., Johnsen's, Terisass, Make Auto Parts Manufacturing, Sherco-Auto, Dweekiy, Speedol, C and R Racing Radiators, Irontite, Niteo, Alumaseal, Gold Eagle And Cyclo. Hope this listing can make your shopping choice much easier.

* Cherrypicksreviews.com is reader-supported, Our editor review, and recommend the best products based on extensive data analysis, if you click on the product links, we may earn a commission through qualifying products purchased.

The Best Radiator Sealers Rated by CherryPicks

Market Overview
Radiator Sealers Reviewed
  • Reviews Analyzed: 8,217 Items
  • CPR Avg. Rating: 8.5 / 10
30 Products Evaluated
  • Highest Price: $119.89
  • Lowest Price: $3.08
  • Avg. Price: $17.79
Price Disclaimer

Top 30 Radiator Sealers on Amazon (Verified You can Buy)

Top 1

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

Prestone
AS145
1.91 x 3.04 x 5.64 Inches
0.8 Pounds

Ratings for Prestone (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -
Gatzies 1,206

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
Show More
Top 2

J-B Weld 2120 Radiator Repair Kit

J-B Weld
2120
2.0 x 4.0 x 8.0 Inches
0.1102 Pounds

Ratings for J-B Weld (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

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.
Show More
Top 3

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

Bar's Leaks
PLT11
3.0 x 3.0 x 6.0 Inches
0.6875 Pounds

Ratings for Bar's Leaks (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Seals leaks
Conditions cooling system
Show More
Top 4

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

Bar's Leaks
1109
7.5 x 2.6 x 2.6 Inches
1.125 Pounds

Ratings for Bar's Leaks (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Seals larger leaks seals
Repairs heater core leaks
Show More
Top 5

AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card - 20 g

Alumaseal
ASBPI12
5.0 x 1.0 x 3.0 Inches
0.0438 Pounds

Ratings for Alumaseal (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
MaxWarehouse 354
Drive Buy Deals -
Monet Enterprise LLC -

Features

Stops leaks safely, quickly and easily
Top 6

BlueDevil Products 00205 Radiator & Block Sealer - 16 Ounce

BlueDevil Products
00205
2.75 x 2.75 x 7.25 Inches
1.0 Pounds

Ratings for BlueDevil Products (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Blondee Wholesale 1,490
The Original AutoParts USA -

Features

Permanent repair for radiator and block leaks.
Works effectively on plastic, aluminum and/or metal radiators
Show More
Top 7

C and R Racing Radiators 59-00001 Dike Stop Leak, 1 Pack

C and R Racing Radiators
59-00001
4.1 x 1.9 x 5.9 Inches
1.2 Pounds

Ratings for C and R Racing Radiators (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
JEGS 2,573

Features

Can prevent a DNF in the event of a radiator puncture, cracked cylinder head, or head gasket Problem
After extensive research, C & R racing has found a stop leak that doesn't leave a residue
Show More
Top 8

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

Bar's Leaks
HDC
7.5 x 5.0 x 0.8 Inches
0.1 Pounds

Ratings for Bar's Leaks (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -
JBTools 241
Bicyclingfanatic -

Features

Seals leaks
Conditions cooling system
Show More
Top 9

Bar's Leaks Radiator Stop Leak 2X Concentrate, 6 oz.

Bar's Leaks
1194
1.8 x 3.0 x 6.5 Inches
0.42 Pounds

Ratings for Bar's Leaks (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -
VerSure 26
Bicyclingfanatic -
Multi Brands 305 -

Features

Product type :Auto Accessory Stops and seals coolant leaks
Package dimensions :4.064 cm L x6.096 cm W x12.446 cm H It has double the power of most other stop leak products and saves
Show More
Top 10

AlumAseal ASLC16 Radiator Stop Leak and Conditioner Liquid - 16 Fl oz.

Alumaseal
ASLC16
4.0 x 1.75 x 8.25 Inches
1.18 Pounds

Ratings for Alumaseal (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Moofin 298
Etailforest LLC -
FlippinAwesomeDeals -
Team Dillard -
Florida Tools & Hardware Sales -

Features

Stops leaks safely, quickly and easily
Compatible with all antifreeze and coolants
Show More
Top 11

Alumaseal ASBPI12 1 Oz Radiator Sealer

Gold Eagle
ASBPI12
14.0 x 4.5 x 6.0 Inches

Ratings for Gold Eagle (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
JANZMAR LLC -

Features

Inhibits rust
Lubricates water pump
Show More
Top 12

Permatex 09116 Fuel Tank and Radiator Repair Kit

Permatex
09116
1.5 x 0.7 x 1.4 Inches
0.2 Pounds

Ratings for Permatex (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Seals holes, seams, or cracks on metal tanks, radiators, or gas cans
Quickly and easily knead together the two-component stick to form a tight seal
Show More
Top 13

Niteo Motor Medic C312 Radiator Sealer and Stop Leak - 11 oz.

Niteo
C312
2.8 x 2.8 x 5.7 Inches
0.9 Pounds

Ratings for Niteo (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -
UNIQUE AUTO ACCESSORIES -

Features

MOTOR MEDIC is a local family owned company based out of Charlotte, NC. For more than 75 years, LIQUID WRENCH products, developed by the people who use them, has earned the trust of hard-working tradesment and the active DIYer through consistent, superior performance and a commitment to innovation.MOTOR MEDIC
Top 14

Cyclo - Cooling System Stop Leak & Sealer

Cyclo
C52-EACH
72.0 x 36.0 x 36.0 Inches
0.5 Pounds

Ratings for Cyclo (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Quickly finds and seals leaks with natural fibers
Polishes water pump seals thus preventing leaks
Show More
Top 15

Speedol F6 Radiator Stop Leak Cooling System Sealer, 10.14 Oz (300 Ml) Bottle | Fixes Minor Leaks and Seepages in The Radiator

Speedol
8542048174

Ratings for Speedol (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Speedol -
Top 16

Hapco Products - Cooling System Sealer (Pack of 2)

Hapco Products Co.
516P2
100.0 x 100.0 x 50.0 Centimeters
100.0 Kilograms

Ratings for Hapco Products Co. (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Hapco Products Co. -

Features

Use for head gasket, heater core, freeze plug, block and radiator leaks
Mixes with all types of antifreeze
Show More
Top 17

Liqui Moly 3330 Radiator Sealant 150 ml

Liqui Moly
3330
2.126 x 2.126 x 4.7244 Inches
0.3483 Pounds

Ratings for Liqui Moly (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
AutoLove -
KAYA HOME -

Features

Content 150 ml
Suitable for aluminum radiators
Show More
Top 18

Stic-Tite Aluminum Radiator Repair

Speedway Motors
9.0 x 6.0 x 1.0 Inches
1.0 Pounds

Ratings for Speedway Motors (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Speedway Motors 2,988

Features

automotive radiator sealers
Top 19

Sherco-Auto K-Seal Multi Purpose One Step Permanent Coolant Leak Repair 8 oz Gasket Radiator

Sherco-Auto
0.5 Pounds

Ratings for Sherco-Auto (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Sherco Automotive & Marine Supplies -

Features

Sold as (1) 8 0z. Bottle
Permanent coolant leak repair - Just shake, pour and go. Mixes with all antifreeze. No draining or flushing.
Show More
Top 20

Alumaseal ASBPI12 1 Oz Radiator Sealer

Alumaseal
8105843
84.0 x 4.5 x 6.0 Inches
3.84 Pounds

Ratings for Alumaseal (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Highway To Buy LLC -
Top 21

K&W Instant Cooling System Stop Leak, 15 Fl Oz, (Pack of 6), 401214x6

CRC
401214x6
3.12 x 1.75 x 7.75 Inches

Ratings for CRC (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -
Rugged Parts -

Features

Using nanotechnology, this product fills in cracks & crevices other products can't, making a stronger, more solid bond than competitors' products
Compatible with all types of anti-freeze
Show More
Top 22

Irontite All Weather Seal, Blue, 16 oz

Irontite
468-9130-16
2.38 x 2.38 x 8.13 Inches
1.0 Pounds

Ratings for Irontite (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -
G.P.S. 360
JBTools 241

Features

Pour and Go - into your existing coolant mixture
Stays dissolved and suspended now and long into the future.
Show More
Top 23

Make Auto Parts Manufacturing Front Under Radiator Support Undercar Shield Plastic Material For Ford Fusion 2010-2012 - FO1228114

Make Auto Parts Manufacturing

Ratings for Make Auto Parts Manufacturing (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Make Auto Parts Manufacturing -
Top 24

Bar's Leaks Cooling System Radiator Stop Leak 16.9 oz.

Bar's Leaks
1186
7.8 x 2.6 x 7.4 Inches

Ratings for Bar's Leaks (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -
MaxWarehouse 354

Features

Bar's Leaks Liquid Aluminum Stop Leak seals radiator leaks. Seals freeze plug leaks. Repairs gasket leaks and heater core leaks. Lowers water temperature.
Seals radiator leaks
Show More
Top 25

Johnsen's 4918 Radiator Stop Leak - 12 oz.

Johnsen's
4918

Ratings for Johnsen's (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
OTCRx4u 125
Gustotrade 332
ACforCars -

Features

Johnsen's 4918 Radiator Stop Leak - 12 oz.
Top 26

Terisass Coolant Tank RadCoolant Tank Radiator Cover with Pressure Relief Port 13502353 13502509 68249136aa Compatible with Bui_ck AllureCascadaEncore for Original Equipment Replacement, normal

Terisass
0.3937 x 0.3937 x 0.3937 Inches
0.1146 Pounds

Ratings for Terisass (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Terisass -

Features

[Applicable accessories]The coolant recovery bottle cap is a practical accessory that can replace the origil numbers 13502353, 13502509, 68249136AA, which is very suitable for your vehicle. The professiolly manufactured coolant reservoir cover is very suitable for BUICK ALLURE / CASCADA / ENCORE. It will bring you a different experience.
[High Quality]It is manufactured by the OE manufacturer according to strict OE specifications and is 100 Percent inspected before leaving the factory to ensure product safety, stability and durability. It has been carefully designed for the outdoor cooling system and overflow box system to provide the same components and functions as the origil version of the specific car.
Show More
Top 27

Radiator Guard, Motorcycle Radiator Guard Protector Grille Grill Cover for Honda NC750 NC750S NC750X 12-onward

Dweekiy
15.748 x 11.811 x 2.3622 Inches
1.1244 Pounds

Ratings for Dweekiy (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Dweekiy d1 -

Features

Fitment: Fit for Honda NC750S 2012-onward NC750X 2012-onward NC750D 2012-onward.
Fitment: Fit for Honda NC750S 2012-onward NC750X 2012-onward NC750D 2012-onward.
Show More
Top 28

Vibrant Performance 20980 Radiator Filler Neck

Vibrant Performance
20980
0.0 x 0.0 x 0.0 Inches
0.08 Pounds

Ratings for Vibrant Performance (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -

Features

Package Dimensions: 15.9 H x 1.8 L x 8.6 W (centimetres)
Country of Origin : China
Show More
Top 29

Bars Leaks Radiator Stop Leak Concentrate (1196)

Bar's Leaks
1196

Ratings for Bar's Leaks (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Bigler Direct -
Advance Cycle Parts -
DataAlchemy -
First Harmonic Limited -

Features

Brand: Bars Leaks
Radiator Stop Leak Concentrate
Show More
Top 30

Chrysler Genuine Accessories 4318005 Stop Leak Pellet

Chrysler
4318005

Ratings for Chrysler (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Amazon.com -
World Parts Direct -

Features

Conditions cooling system
Inhibits rust and corrosion
Show More

Top 10 Radiator Sealers - Verified to Buy (Apr. 2024)

Top 10 Radiator Sealers Brands on Amazon

Here is the list of top-rated brands that were evaluated by CherryPicks.

  • Prestone
  • J-B Weld
  • Bar's Leaks
  • Alumaseal
  • BlueDevil Products
  • C and R Racing Radiators
  • Gold Eagle
  • Permatex
  • Niteo
  • Cyclo

Top 10 Radiator Sealers Sellers: CPR Seller Rank List

CPR sellers rank is based on CherryPicks-AI bestselling ranking system that helps us analyze each seller's sales trends. The List of top seller ranks is our in-house data, essential for our product ranking to help you make the right shopping choice.

  • 1. VerSure : 25,732 Yearly Feedback , Avg. Ratings 4.9
  • 2. OTCRx4u : 11,070 Yearly Feedback , Avg. Ratings 4.7
  • 3. JBTools : 7,916 Yearly Feedback , Avg. Ratings 4.8
  • 4. Moofin : 7,058 Yearly Feedback , Avg. Ratings 4.8
  • 5. Gustotrade : 6,497 Yearly Feedback , Avg. Ratings 4.9
  • 6. MaxWarehouse : 6,214 Yearly Feedback , Avg. Ratings 4.7
  • 7. G.P.S. : 6,146 Yearly Feedback , Avg. Ratings 4.9
  • 8. Gatzies : 2,822 Yearly Feedback , Avg. Ratings 4.6
  • 9. Blondee Wholesale : 2,474 Yearly Feedback , Avg. Ratings 4.6
  • 10. JEGS : 1,701 Yearly Feedback , Avg. Ratings 4.6
Rank Name Yearly Feedbacks Avg. Ratings
🥇 VerSure 25,732 4.9
🥈 OTCRx4u 11,070 4.7
🥉 JBTools 7,916 4.8
4 Moofin 7,058 4.8
5 Gustotrade 6,497 4.9
6 MaxWarehouse 6,214 4.7
7 G.P.S. 6,146 4.9
8 Gatzies 2,822 4.6
9 Blondee Wholesale 2,474 4.6
10 JEGS 1,701 4.6
View or download top Radiator Sealers seller & rating report
VerSure [25732] OTCRx4u [11070] JBTools [7916] Moofin [7058] Gustotrade [6497] MaxWarehouse [6214] G.P.S. [6146] Gatzies [2822] Blondee Wholesale [2474] JEGS [1701] VerSure 33% OTCRx4u 14% JBTools 10% Moofin 9% Gustotrade 8% MaxWarehouse 8% G.P.S. 8% Gatzies 4% Blondee Wholesale 3% JEGS 2%

[Get] Radiator Sealers Deals (✅Exclusively for Prime)

What does "Amazon Fulfilled" Mean?

Amazon Fulfilled refers to products handled by Amazon's logistics, which indicates that the product is stored, packed, and shipped by Amazon from one of its fulfillment centers.

When you order a product that is "Amazon Fulfilled," Amazon takes care of the storage, packing, shipping, and customer service for that product. This often ensures quicker delivery and better customer service compared to products that are not fulfilled by Amazon. It also means that the product is eligible for Amazon's return policy.

What does "Prime" Mean?

"Prime" refers to Amazon Prime Member (Join Amazon Prime Now), which indicates eligibility for Prime benefits. When you see "Prime" next to a product on Amazon, This generally means that if you are  an Amazon Prime member, you can get free two-day shipping on that product, and sometimes even same-day or one-day shipping depending on your location.

Prime members also have access to other benefits, including 2-Day ShippingExclusive Member DealsPrime VideoBuy With PrimeAmazon MusicPrime Gaming, and more.

Shop Prime Radiator Sealers Deals

What does "Free Shipping" Mean?

"Free Shipping" means that you will not be charged additional fees for the shipping of that product. However, unlike "Prime," which usually guarantees fast two-day shipping, "Free Shipping" doesn't necessarily mean fast shipping.

Sometimes there might be a minimum purchase requirement to qualify for free shipping if you are not a Prime member. For Prime members, the "Free Shipping" usually refers to the free two-day shipping that is one of the benefits of the Prime membership.


Why Should You Trust Us?

Now hundreds and thousands of Car Care supplies are available on Amazon, Picking the right one is not easy, and that may take a lot of your time, Right? and What is the best Radiator Sealers to buy for new April 2024?

CherryPicks’s Methodology for Evaluating Radiator Sealers

We developed the CherryRatings-AI system to identify and score reviews and the CherryPicks-AI ranking system that uses TensorFlow framework to generate the best list, It will help us evaluate Car Care items that sell on Amazon. The score of items is based on over ten parameters such as analyzing customer review content, product reviewing rating statistics, brand reputation evaluation, comparing product price with features, etc, You can visit How We Rank to learn more in detail.

We collected and analyzed 81 of Radiator Sealers reviews based on our selection criteria. It helped us shortlist the top qualified and rated Radiator Sealers for Car Care, We found that most customers choose Radiator Sealers with an average price of $17.79, and the top brands are Permatex, J-B Weld, CRC, Liqui Moly, Prestone, BlueDevil Products, Bar's Leaks, Vibrant Performance, Chrysler, Speedway Motors, Hapco Products Co., Johnsen's, Terisass, Make Auto Parts Manufacturing, Sherco-Auto, Dweekiy, Speedol, C and R Racing Radiators, Irontite, Niteo, Alumaseal, Gold Eagle And Cyclo. 

Then our expert-level editors reviewed all those quality items and selected the top 30 Radiator Sealers for you, We have researched hundreds of sellers and picked the top sellers for Car Care, including VerSure, OTCRx4u, JBTools, Moofin, Gustotrade, MaxWarehouse, G.P.S., Gatzies, Blondee Wholesale, JEGS, Speedway Motors And DataAlchemy. The Prestone AS145 Stop Leak Repair for Radiators, ... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 226 consumers with an average rating of 4.1.

We've helped a lot of satisfied users get the right Automotive product based on their needs, and save lots of time for them to pick Radiator Sealers to buy.


Written By Craig Hill

Christian Buccho is a mechanic in love with automotive repairs. He will be sharing his experience with us an automotive repairer over the years. He will not only provide us with informative articles, he would also be providing us with hands-on reviews on automotive parts.