K-SEAL Coolant Leak Repair: Best Radiator Stop Leak Solution

When it comes to the best radiator stop leak formula for car engines, then K-SEAL Coolant Leak Repair comes on the priority list. It is the all-purpose radiator sealant that helps in fixing head gasket, blockheads, and other clogging & overheating issues.

K-SEAL Coolant Leak Repair Reviews

K-SEAL Coolant Leak Repair



K-Seal comes with a 5-star rating in stopping leakages inside the engine. Also helps in fixing problems of clogging, over pressurizing engines, overheating, and filling up the tiny holes.
Stop Leaks and Seals
Ease of Use
Customer Support


K-Seal is one of the best radiator coolant leak repairs in the automotive industry. This sealant is actually worth its price.


The K-Seal is the best head gasket sealer and a multipurpose heavy-duty product in terms of its competitors. It is a one-step process product and repairs the entire cooling system in around 3 minutes. This is the best coolant leak sealer.

Along with this works well on all types of heads such as heads of radiators, radiators with hard plastic, and also for blocks in larger engines. This product is generally made for big-capacity engines like RVs, AG, and tractors.

Permanently seals the holes and leakages of engines. It also works as an agent of fixing blown head gaskets, freeze plugs, blocks, overheating of engines, and leaks.

Mixed with all types of antifreeze and does not require any draining and flushing the required thermostats. A safe and effective product for a heavy-duty coolant system and can fill the cracks up to 1/32 inch.

Why choose K-SEAL Leak Repair?

K-Seal has been selling products for a few years and people are loving their product. So we survey and found it quite helpful. And all the personal reviews and research gives the answers to the questions.

However, some coolant leaks and cracks fix fast. Sometimes K seal didn’t work quickly but wait, some leaks take time so please check if there is no over-pressurization of the engine.

One bottle is as much as effective for the cooling system up to 55 sets/ 66 liters.

Benefits of K-Seal Radiator Stop Leak

The benefits of this head gasket repair are explained below in detail

  • A multipurpose and heavy-duty product. Made for big capacity engines like RVs.
  • An easy-to-use and one-step process best head gasket sealer.
  • No requirement of draining out the engine, flushing, and pulling the thermostats. Mixed with all types of antifreeze.
  • This solution can be added to the overflow tank as well.
  • A 4.0 rating product out of 5.
  • Within 3 minutes it can fix the holes and leakages permanently.
  • It works on freeze plugs, fix the overheating of the engine, heater cores, head gasket, and cracked heads.

Product Description

K-Seal Head Gasket Sealer Product Description

This best head gasket sealer is the brand of K-SEAL and the model number is ST5516.


K seal is 8 fluid ounces and one bottle (16oz) is effective for 20 quarts capacity of cooling.

This product comes in 1.2 pounds and its dimensions are 5.9 x 4.1 x 1.9 inches

Mixed and blended with all types of antifreeze there is no requirement of any draining or flushing of the engine.

Saves money and time. The price of the product is friendly and everyone can easily afford it.

How To Use K-Seal Coolant Leak Repair Formula In Car Engines?

K seal is simple and easy to use the product. Just “Pour and Go”. However, you have to look at some simple instructions given below:

  • Shake the bottle well before using it.
  • No flushing or draining of the system is required during the process.
  • And no need to remove the thermostat or sparks.
  • The best part of this product is that it can be added to both cold and hot engines.
  • In the case of over-pressuring. Just simply do bypass the header tank and pour the solution directly into the coolant system.

Notice- Please take advice from the technician in case you’re unsure of anything


Read the instructions on the K-SEAL Coolant Leak Repair label carefully. Try to avoid contact with eyes and skin.

All the reviews of this best stop leak sealant for radiators and information are generated through personal reviews.

Read also: 5 Best Radiator Stop Leak: Reviews & Buying Guide

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