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The Best Radiator Sealers

Looking for the best Radiator Sealers?

Discover now our comparison of the best Radiator Sealers. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Radiator Sealers are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Radiator Sealers in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.

SaleNo. 1
K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
  • Permanent Coolant Leak Repair: K-Seal’s unique formula will seek out holes and cracks, and permanently seal them, with no adverse impact on the efficiency of your engine cooling.
  • Versatile Usage: Fixes cracks and leaks in the radiator, head gasket, freeze plugs, cylinder heads, heater core, water pump casing and engine blocks
  • Universal Solution: This coolant stop leak is universally applicable. It can be used with all types of antifreeze, making K-Seal an essential tool for any vehicle owner
  • No Draining or Flushing: K-Seal coolant leak repair is easy to use. It eliminates the need for draining or flushing, making it a convenient solution. Just shake, pour and go.
  • Effective Cooling: The K-Seal 8 fluid ounce bottle is effective up to 20 quarts of cooling capacity
No. 2
Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz
  • Repairs gasket leaks
  • 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 freeze plug leaks
  • Seals radiator leaks
No. 3
CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz
  • Permanent molecular seal that’s as strong as steel
  • Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and copper, aluminum and bi-material radiators & heater cores
  • For use in all water-cooled diesel and gasoline vehicles
  • Withstands extreme pressure and temperatures of a cooling system and will not wash away
  • Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems
No. 4
Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams, Brown
  • Seals leaks
  • Conditions cooling system
  • Inhibits rust and corrosion
  • Lubricates water pump seals
  • Helps control electrolysis
No. 5
Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.
  • PERMANENTLY FIXES COOLING SYSTEM LEAKS: . One step formula permanently repairs coolant loss problems on cars, trucks, vans, SUV’s and RV’s.
  • ANTIFREEZE COMPATIBLE - NO DRAINING REQUIRED: Antifreeze compatible sodium silicate liquid glass penetrates large and small leaks in plastic, aluminum and cast iron heads, blocks, intake manifold & gaskets, freeze plugs, heater cores and radiators.
  • ONE STEP - POUR DIRECTLY INTO RADIATOR - EASY TO USE: Fiber additives lock together with liquid to increase strength and promote a permanent seal. It will not harm the coolingsystem when used properly, no draining is required.
  • USE WITH ALL TYPES OF TRADITIONAL OR EXTENDED LIFE COOLANT: Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.
No. 6
Prestone AS145 Stop Leak Repair for Radiators, Heater Cores, and Hoses, 11 oz., 1 Pack
  • 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
No. 7
Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz.
961 Consomer Reviews
Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz.
  • Seals leaks
  • Conditions cooling system
  • Inhibits rust and corrosion
  • Lubricates water pump seals
  • Helps control electrolysis
SaleNo. 8
J-B Weld 2120 Radiator Repair Kit
  • 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.
No. 9
Super Glue Pro Seal N62020 Instant Gas Tank and Radiator Repair
  • Instant Gas Tank and Radiator Repair
  • 0.7-Ounce strip
  • Easy to use putty
  • Permanently seals cracks and split seams
  • Hardens like steel
No. 10
Dike Radiator Stop Leak - 1 Pint
  • Stops Leaks In Radiators In Seconds Helps Gaskets
  • Works With All Standard And Permanent Antifreezes
  • Preventing Antifreeze And Water From Seeping Into The Engine
  • Will Not Block Small Passages In The Cooling System
  • Keep Dike In Your Vehicle Emergency Kit For On-The-Spot Repairs Or As a Preventative Measure For Vehicles Operating Under Severe Conditions. Add One Pint To Every Four Gallons Of Coolant Or Water.
  • WHAT'S INCLUDED: (1) Pint of Dike Radiator Stop Leak

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Last update on 2024-04-27 / Affiliate links / Images from Amazon Product Advertising API