Best Head Gasket Sealers For Your Car 2018 Reviews

If you own an older car, then head gasket failure is one of the irritating situations that can happen anytime and anywhere.You may probably wonder what the best head gasket sealer in the market is. Because they are many, you might purchase one that interferes with your car’s functions.

You do not need to go through these unfortunate circumstances, however. This head gasket sealer review will give you some tips on choosing a good sealer and highly recommended products in the market.

What is a Head Gasket?

A head gasket is a mechanical seal located in the mid of the cylinder head and the main engine. Its function is sealing the head and therefore preventing the leakage of coolant or engine oil by sealing the gasket, therefore, ensuring maximum compression.

Older engines, in particular, are prone to leaky gaskets.When you value the products you use on your vehicle, then you can search on head gasket sealer reviews to help make sense of the options available to you.

Actively finding good sealers is a good choice, as they save you hours of stress and expensive repairs when you would be doing something else.

Car engines are delicate things; even slight tampers could make you send your car to the nearest scrap yard. The cost of repairing a head gasket is both time-consuming and costly; you would not want to incur huge costs in fixing your engine.

What Is Head Gasket Failure?

Failure of the gasket results in water and lubricating oil mixing, or entering the momentum chamber.

Some factors can cause failure, which includes the general age of the motor, a history of overheating and lack of regular maintenance.

Because prevention is better than cure, make sure you regularly service your car and take it for check-ups to your mechanic to prevent gasket problems before they become roadside breakdowns.

Common Symptoms of Possible Head Gasket Failure

  • A white/yellow mixture inside the oil filler cap – Referred to as “mayonnaise” because it looks like it. One thing to note, however, mayonnaise may form on engines that are not used much because of condensing inside the cap. Do not worry too much about this, but keep in mind that it is good to drive your car more often to avoid parts enclosing through lack of use.
  • Flat spots while driving – this is indicative of two issues: either, fuel problems within the engine or water or oil is entering the combustion chamber. This might interfere with ignition and burning of fuel.
  • White smoke from exhaust – when starting your car early in the morning, you might see white smoke from the exhaust pipe due to condensation in the exhaust pipe drying out.

    Note that, if the warmed up car still displays white smoke after 15 minutes driving, then water could be making its way from the coolant system into the combustion chamber.

  • Blue smoke from exhaust – this alone indicates piston ring wear, especially in old cars with more than 100,000 mileage. For this situation, this is not threatening to your vehicle’s engine.

    Nevertheless, look out for signs of oil entering the combustion chamber, indicated by blue smoke with mayonnaise from the chamber itself. This means that engine oil is burning instead of petrol, and you should change your gasket as soon as possible.

  • Occasional uneven engine tick-over – Head gaskets do not fail straight away. It can take time, with one of the cylinder sections failing.

    Signs to look at are like irregular operation at specific parts of the rev range, and white smoke that may only occur at certain speeds. This happens because the head gasket may only fail within one section, affecting that specific cylinder.

How to Fix It

All these problems with head gaskets can seem intimidating, but there are some tips to fix a cylinder head gasket failure.

  • Re-twist head nuts – it may be that your local mechanic may not have properly tightened the head screws, but you can solve the problem quickly by using a good wrench to re-fasten them.
  • Replacing the gasket – both a time-consuming and expensive operation. It can discourage you if you do not have much patience to dismantle the entire system to remove the head gasket properly.
  • Read more: How to Fix a Blown Head Gasket Without Replacing it

  • Use a head gasket sealer– this means no costly, time-consuming and recurrent visits to repair your vehicle. You can quickly repair your engine using the best head gasket sealer available.
best head gasket sealers


What is a Head Gasket Sealer and How Does It Work?

Head gasket sealers are liquids that contain sodium silicate, antifreeze components and various sizes of gasket sealing particles, and strengthened with carbon fiber. How does it work?

Pour the liquid into the radiator cap, and it flows through the engine’s cooling system until exposed to a gap. This makes the particles harden as a result and stop the leak.

The use of sealers is simple enough for most DIY mechanics to perform the task themselves; if they are certain, the car problem is a result of damage to the head gasket.

In these instances, fixing the cars do not need costly mechanical work – and you will be back on the road in no time. Depending on the extent of the damage to your head gasket, consider using a sealer as a permanent or temporary means of fixing your car issues with all the advances in technology today.

Questions to Ask

The initial search for a good head gasket sealer may be difficult. There are questions you should ask to get a good quality sealer, which includes:

  • How compatible is it with most vehicles and engines?
  • Question its compatibility with other anti-freeze products
  • Consider the waiting period to starting your car is important
  • How long does the repair last on average?

It is important to consider the best sealant for your car, so asking these questions is vital. You do not want to ruin your engine, neither fix it with only the best quality head gasket sealers. This head gasket sealer review will help to answer these questions easier for you.

Reviews of the 5 Best Head Gasket Sealer

#1. Blue Devil Gasket Sealer

We tested it on my uncle’s Toyota Corolla vehicle, which started showing signs of leakage as we were on a long journey. The regular mayonnaise found on the oil cap was the main symptom, although it had yet to start smoking badly from the rear.

The good thing about Blue Devil is the fact it does not contain particles within the solution. This means your water pump and seals will not suffer wear, making this fix one for the long term.

Pro tip: when testing or using this sealant, it is advisable you empty the present water in the cylinder, top it up with the sealant and run the car for about 15 minutes.

Overall, it took about 120 minutes to install the fluid and seal the gaskets. This was very quick considering the strip down needed if you changed the entire gasket, making it one of the best head gasket sealers.

  • Very easy to use
  • Sold at a reasonable price
  • Does a good job of sealing gaskets
  • Trusted and recommended by many users
  • Some customers complained that the product killed their engine
  • Left the gasket noisy.

Highly recommended! A word of advice, though: make sure you thoroughly clean your system and slowly install the fluid. This way the improvement of your engine will last longer.

Read full review here

#2. Bar’s Leak Head gasket sealant

Many people have claimed that this sealant can repair cracked gaskets instantly, including one of my uncles who is a long-time customer of the product. This claim may sound skeptical, but we wanted to try it and see if it works as promised.

After a whole process of cleaning the engine and restarting our car, surprisingly, the engine ignited at the second try! Again, the results were excellent, considering it was not in use for almost 7 months!

  • Used on multiple types of cylinders
  • Easy to use
  • Versatile
  • Works properly and can seal gaskets well
  • Quickly stops radiator leakage
  • Long-lasting results
  • Customers complained that it did not fix the leak even if they followed the instructions.

Worked very well on the cylinder head so that it will perform the same task on a blown gasket too. This is highly recommended!

Read full review here

#3. K&W Permanent Head Gasket and Block Rep

If you are searching for a versatile, long-lasting gasket sealer for all types of surfaces, then you need to try this product. Made to seal head gaskets, K&W is highly recommended for all types of surfaces.

Use it on painted surfaces as well as plastic and metal parts, buses, trucks and other types of vehicles. One of the best head gasket sealers today, known not only for sealing gaskets but also for coolant leaks.

It can also seal intake gaskets, head gaskets, and many others. This is all due to the technology in the sealant, which also contains fibers that deliver effective, quick and long-lasting results.

  • It is easy to use; all you have to do is shake and pour this liquid solution.
  • You can use iton different surfaces.
  • It is made of durable materials.
  • It is affordable compared to other sealers.
  • Provides you with long-lasting results.
  • Some customers complained that it did not work on their vehicles.
  • It blocked the radiator.
  • It gummed the cooling system even if some customers followed instructions.

Read full review here

#4. K-Seal ST5501 Multi-purpose Coolant

The manufacturers of the K-Seal ST5501 Coolant have the scientifically engineered combination of copper and microfiber particles works by adding the liquid into the engine’s existing coolant.

The best part is you do not need to flush the engine at any point, a task that is time-consuming. The sealant can repair tiny cracks, so there are low chances of blocking engine tubes.
Key Features

  • Mixes with all variants of antifreeze
  • You do not need to drain the engine of existing coolant
  • It quickly repairs cracks in the engine
  • Does not accidentally block engine tubes
  • Simple shake, pour and go usage
  • No debris flushing required
  • Repairs holes up to 0.0635mm – it does not repair holes below this range
  • Effective to 20 quarts cooling capacity

Read full review here

#5. CRC 401232 Permanent Head Gasket

This head gasket sealant makes stronger bonds by filling cracks and crevices.The sealant has been on the market for more than 40 years and is widely trusted by many consumers over the years, establishing itself as a highly sought-after gasket cooler. The many improvements in its formulation work through strengthening cracks in your engine.
Key Features

  • Made with a nanotechnology formulation
  • Permanent repair to crack and leaks
  • Trusted by mechanics and suppliers
  • Makes stronger bonds
  • Nanotechnology formulation
  • Permanent repair
  • There is a limit to the repair this sealant can do – it cannot repair smaller cracks effectively


If you are looking for a long-lasting solution to your problem, invest in the Blue Devil Head Gasket Sealer. Considered one of the best head gasket sealers, it is compatible with all types of engines.

It takes quite some time before you find a good sealer, but it is worthwhile since you will not have to worry about the chances of your car breaking down.

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