Reviews

3 Best Head Gasket Sealers of 2022 – Editors Pick

If you’re an expert on cars, you’ll know that finding the best head gasket sealer can be tricky. Head gaskets themselves are vital to an engine, so investing your money and faith into the best head gasket sealer means investing time and energy into finding one that will last. But what separates a good head gasket sealer from the best head gasket sealer? Well the answer is easier than you may think.

To start, it’s probably important that you understand what a head gasket is. A head gasket is a gasket that sits between the engine block and the cylinder head in an engine and its job is to seal the cylinders to maximum compression so that your car does not leak coolant or engine oil into the cylinders. It’s no joke trying to find the best head gasket sealer because a total repair of a head gasket is pretty high – costing between $1200 and $1600 depending on the type of vehicle you have. So if you’re going to go the easier route, purchasing a head gasket sealer, you want to make sure that it’s worth it.

Quick Comparison Chart

All in all, these are 3 of the best head gasket sealers on the market today, and if they weren’t good, they wouldn’t have made the list. However, that doesn’t mean that certain head gasket sealers are suited to all types of customers. The chart below sums up the most important parts about the above analysis of these products.

BlueDevil Head Gasket Sealer Bar’s Leaks 1111 Head Gasket Fix K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair
Oz per bottle 32oz 24oz 9.6oz
Price $$$ $$ $
Time 1 hour 30 minutes 10 minutes

Questions to Ask

The initial search may be difficult. There are many head gasket sealers on the market these days and all of them average at a similar price. But there are some questions you should ask yourself when searching head gasket sealers like:

  • Is it compatible with most vehicles?
  • Can the head gasket sealer be used on different types of engines?
  • ​Is it compatible with anti-freeze products?
  • How long do you have to wait between application of the sealer and starting your vehicle?
  • Is it easy to apply to the radiator?
  • How long does the repair last on average?

This may seem like a long list of questions to ask, but they are all vital when researching which head gasket sealer is the best to use for your car. Your engine is not something you want to mess with, so you should fix it with only the most quality of head gasket sealers. Our list of the 3 best head gasket sealers will help make these questions easier for you.

3 Best Head Gasket Sealers


BlueDevil Head Gasket Sealer

BlueDevil boasts that it will “repair and seal leaks in blown head gaskets, warped or cracked heads, heater cores, and freeze plugs”. Not only is it multi-purposed, but this product can be used over and over again, as it comes in a 32oz bottle. BlueDevil also offers a 90-day money-back warranty if the customer follows the instructions and the product does not work.

This head gasket sealer has saved many car owners from expensive repairs. For example, one reviewer who said that this product saved them $2,000 in repairs. Others have claimed that they had tried other products before and BlueDevil Head Gasket Sealer was the one that finally fixed their problem for good. That is why the Blue Devil product is on our best head gasket sealer list today!
What is also great about BlueDevil is that it is certified by well-known, reliable, car repair stores, like:

  • AutoZone
  • Advanced Auto Parts
  • ​NAPA Auto Parts
  • Pep Boys
  • Fast Track

It is also available on Amazon. This product is easily attainable, so if you need a quick fix and fast then BlueDevil may be the best bet for you.
Other pros of BlueDevil Head Gasket Sealer include:

  • Compatibility with gasoline and diesel engines
  • Contains no solid or particulate matter so your engine does not clog
  • Safe and easy to use

The directions are clear and easy to follow and while you may have to dedicate some time to letting the product work its way through the gasket and run your car for a while it will save you more time and even more money in the long run. With the money-back warranty and its compatibility with multiple engines, BlueDevil is a great choice for the average car owner looking to cut some corners in terms of engine maintenance.

One downside to this product is that it does not work on a water pump steal that is leaking in – in which case you’d have to replace the head gasket anyway. It’s a significant downside, but if you understand this going in to buying the product then you can avoid this issue altogether.

Another setback may also be the price. Depending on how much you’re willing to spend on this product, the price may be a big deciding factor.


Bar’s Leaks 1111 Head Gasket Fix

What is great about Bar’s Leaks is that they understand how difficult it is to be on the search for a quality head gasket sealer. Their product description on Amazon is a lot more in depth than what BlueDevil has to offer. Bar’s Leaks says:
“We know firsthand that fixing a blown head gasket requires a hefty chunk of change and a few days without your car. Who has time to spend taking their car to the shop for a blown head gasket? And who has the extra cash to pay for a blown head gasket without planning for it? No, visiting the shop for a blown head gasket fix isn’t ideal. But what if we told you it was possible to fix this yourself with one of the most reliable blown head gasket solutions on the planet? Our easy-to-use Bar’s Leaks Head Gasket Fix will not only save you all that cash, but also get you back on the road in less than an hour.”

BlueDevil claims that it will take about an hour for their head gasket sealer to activate while Bar’s Leaks says that it will take less than an hour. Time is a key factor when buying any product – if it takes too much time that is time that you are taking away from doing something else in order to repair your car. Depending on your point of view, Bar’s Leaks may be the better choice in terms of time management.

Also, what is great about Bar’s Leaks is the price. A 24oz bottle of Bar’s Leaks Head Gasket Fix costs around $23 as opposed to the $50 for 32oz. If you are on a budget and need a quick fix for your head gasket problem, Bar’s Leaks may be the choice for you.

Other pros to Bar’s Leaks 1111 Head Gasket Fix:

  • One-step only method
  • Compatible with antifreeze
  • ​Permanent solution for repair and sealing

With time efficiency and a one-step only method on its side, Bar’s Leaks 1111 Head Gasket Fix easily has a space in the Best Head Gasket Sealers List. But, this analysis of the product would not be complete with at least one con to consider before purchase.

The one thing to consider is that if you intend to use it on anything with copper, it won’t work completely. You can flush the cooling system and then turn off the engine in order to set things, but, again, it is something to consider before purchase. Although, if you have this problem, at least you spent 30 minutes getting it to work as opposed to an hour and you still have some cash in your pocket.


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

Out of all of the sealers on this list, K-Seal is the least expensive of them all. Compared to BlueDevil, which is $50, and Bar’s Leaks, which is $23, K-Steal is $15. However, the trade-off is that K-Seal is 9.6oz, far less offered than either BlueDevil or Bar’s Leaks.

Like Bar’s Leaks, K-Seal is a one-step only method. You only need to “shake the bottle, add the fluid to your coolant system, and run your engine as normal. 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.” Pretty simple and effective given the cost.

K-Seal also mixes with all antifreeze, requires no draining or flushing (unlike BlueDevil and Bar’s Leaks), and only has to be shaken and poured into the head gasket per instructions. The easy instructions are less complicated than the BlueDevil ones and make for a quick and easy job as opposed to being overcomplicated.
K-Seal claims that it can fix the following types of leaks:

  • Head gasket leak
  • Engine block leak
  • ​Water pump leak
  • Radiator leak

Whereas the other sealers will only repair head gasket leaks and engine blocks. K-Seal claims that it will fix these types of leaks as well, however there are skeptics that disagree with this notion.
Some say that K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair is only a temporary solution. And experts suggest going to see a professional to check out your leak in addition to using K-Seal. Not to mention that unlike BlueDevil and Bar’s Leaks, K-Seal is meant to be an all-purpose cleaner, however it is more suitable for trucks, RV’s, and more heavy duty engines, as opposed to being made for smaller sedans.
While there may be more cons for K-Seal, it is still a good starter solution for car owners, especially for those who are on a budget.

For someone who is looking for a more permanent fix to their problem, investing money in BlueDevil Head Gasket Sealer is the way to go. It is compatible for all types of engines, and while the instructions are more complex, and the time it takes to active is much longer than the other two, it is definitely more suited for someone looking to escape paying a mechanic $1600. Or, BlueDevil is more applicable for someone who could potentially need more than one use. Also, BlueDevil offers a 90-day money-back warranty, just in case the product does not work per the instructions.

Bar’s Leaks 1111 Head Gasket Fix is more suitable for the middle man. It is both in the middle in terms of time commitment, money, and size. It’s suitable for a wide variety of engines and is one of the easier sealers to use to fix coolant leaks. Don’t forget: it’s quick and easy to use and is revered by many mechanical experts. Overall, it is the choice for people who are looking for a quick fix, but are also concerned about combatting a serious issue that may lead to having to remove their head gasket.

K-Seal is for vehicles like RV’s and trucks. While it offers the simplicity of a one-step method, it is more suitable as a last ditch effort for those desperately in need of a quick fix. As others have said, it would be best to follow up with an actual professional looking at the leak in your head gasket, but as far as quick fixes go, it is the least expensive so in the end it would end up as a no harm no foul situation.

Overall, these products are top of the line and are well worth considering when beginning your hunt in finding the best head gasket sealer to suit your needs. They all answer the basic questions that need to be answered when considering a head gasket sealer and come with a myriad of reviews on Amazon to slew through and find reviewer feedback. Finding the best head gasket sealer may be a time investment, but starting with these three is a good place to start and buying one of them may be the difference between a $1600 repair job and under a $100 fix.