we’ve put together a collection of the best Radiator Stop Leaks that are currently available on the market. To help you find the perfect Radiator Stop Leak among a wide variety of options, we constantly update our collection with new and trending models.

10 Best Radiator Stop Leaks

Based on dozens of customer reviews and ratings, the followings are the top 10 best-selling Radiator Stop Leaks:

# Preview Product Price
1 Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray Bar’s Leaks 1186 Liquid Aluminum Stop Leak – 16.9 oz , Gray $7.01 View Product
2 K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair, Blue K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair, Blue $12.47 View Product
3 Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz. Bar’s Leaks PLT11 Pelletized HD Radiator Stop Leak – 11 oz. $3.36 View Product
4 AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card - 20 g AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card – 20 g $8.74 View Product
5 Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. Bar’s Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak – 18 oz. $9.37 View Product
6 Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams Bar’s Leaks HDC Radiator Stop Leak Tablet – 60 Grams $2.99 View Product
7 Prestone AS145 Stop Leak Repair for Radiators, Heater Cores, and Hoses, 11 oz, 1 Pack Prestone AS145 Stop Leak Repair for Radiators, Heater Cores, and Hoses, 11 oz, 1 Pack $10.61 View Product
8 Bar's Leaks Radiator Stop Leak 2X Concentrate, 6 oz. Bar’s Leaks Radiator Stop Leak 2X Concentrate, 6 oz. $3.15 View Product
9 Liqui Moly 20132 Radiator Stop Leak, 0.25 l, 1 Pack Liqui Moly 20132 Radiator Stop Leak, 0.25 l, 1 Pack $12.52 View Product
10 GOLD EAGLE/303 PRODUCTS ASBPI12 AlumaSeal Radiator Sealer, 0.71 Oz GOLD EAGLE/303 PRODUCTS ASBPI12 AlumaSeal Radiator Sealer, 0.71 Oz $8.49 View Product

Top Rated Radiator Stop Leak Reviews

Since we’ve mentioned 10 different models of Radiator Stop Leaks on the above list, it may be difficult for you to find the right one for your needs. This is why we listed the key features of each of these Radiator Stop Leaks below:

Sale1

Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray
Bar’s Leaks 1186 Liquid Aluminum Stop Leak – 16.9 oz , Gray

$7.01
View Product
Product Highlights:

  • 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
  • Seals freeze plug leaks
  • Repairs gasket leaks
  • Special Shipping Information: This item cannot be returned and has additional shipping restrictions
Sale2

K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair, Blue
K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair, Blue

$12.47
View Product
Product Highlights:

  • Permanent Coolant Leak Repair – Just Shake, Pour And Go
  • Mixes With All Antifreeze
  • No Draining Or Flushing
  • Fixes Cracks And Leaks In Radiator, Head Gasket, Freeze Plugs, Cylinder Heads, Heater Core, Water Pump Casing And Engine Blocks
Sale3

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

$3.36
View Product
Product Highlights:

  • Seals leaks
  • Conditions cooling system
  • Inhibits rust and corrosion
  • Lubricates water pump seals
  • Helps control electrolysis
4

AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card - 20 g
AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card – 20 g

$8.74
View Product
Product Highlights:

  • 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)
5

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

$9.37
View Product
Product Highlights:

  • Seals larger leaks seals
  • Repairs heater core leaks
  • Repairs freeze plug leaks
  • Repairs blown head gaskets
  • Repairs blocks
6

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

$2.99
View Product
Product Highlights:

  • Seals leaks
  • Conditions cooling system
  • Inhibits rust and corrosion
  • Lubricates water pump seals
  • Helps control electrolysis
7

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

$10.61
View Product
Product Highlights:

  • 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
8

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

$3.15
View Product
Product Highlights:

  • 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
Sale9

Liqui Moly 20132 Radiator Stop Leak, 0.25 l, 1 Pack
Liqui Moly 20132 Radiator Stop Leak, 0.25 l, 1 Pack

$12.52
View Product
Product Highlights:

  • LIQUI MOLY Radiator Stop-Leak completely seals such leaks immediately with ease. 
  • Secures the combustion chamber from damages caused by coolant admission
  • For all cooling water and heating systems with and without water filters
10

GOLD EAGLE/303 PRODUCTS ASBPI12 AlumaSeal Radiator Sealer, 0.71 Oz
GOLD EAGLE/303 PRODUCTS ASBPI12 AlumaSeal Radiator Sealer, 0.71 Oz

$8.49
View Product
Product Highlights:

  • Stops leaks safely
  • Safe for all types of radiators
  • Treats up to 22 QT systems

Video Overview

How to stop a coolant leak with Bar's stop leak!

Does coolant stop leak work? Find out as we test Bar’s radiator stop leak and k seal stop leak then blue devil. Is stop leak safe will it clog up your radiator or …

Final Words

So, these are all of the Best Radiator Stop Leaks available on the market. We hope this collection was helpful to find the right Radiator Stop Leak for the money. However, we recommend checking out the features, benefits, and problems of each of these Radiator Stop Leaks before taking your decision.