7 Best Head Gasket Sealers To Save Your Engine In 2023 To Buy Online

best head gasket sealer

If your engine is suffering from a blown head gasket and you can not afford to replace it, going for the best head gasket sealer is your best option.

The Head gasket acts as a seal between the engine block and cylinder head and prevents engine fluid leaks & pressure losses.

A blown head gasket can cause various other malfunctions in your ride, which sometimes can be fatal.

Replacing a head gasket can be an expensive event. It is why opting for a sealer is much better. But it can be done depending on the damage.

You can find numerous head gasket sealers available in the market, making it hard to find the right one for your ride.

Thus, we bring you this list of the 7 best head gasket sealers on the market in 2023. Each product is well-reviewed against its pros & cons to help you make an informative decision.

Pick The Best Head Gasket Sealer For Diesel Engines

A damaged head gasket can lead to oil leakage, engine misfiring, and other car problems. Generally, most car owners are not familiar with this part as it does not require regular maintenance.

You will find issues with it only when it is completely damaged. If it is severely damaged, it needs to be replaced. However, in the initial stages, you can halt the damage by sealing its leakage.

This is where you need a good-quality head gasket sealer, and our list below is all you need to explore.

ImageProductFeaturesPrice
1
best head gasket sealer
J-B Weld Waterproof Versatile RTV Silicone Black Sealant & Adhesive
  • Designed for sealing & bonding uneven surfaces
  • Does not shrink or crack
  • Resist weathering
  • It can be used on automobiles, metals, rubber, & more
  • Versatile, Dependable
  • Affordable
2
best stop leak for head gasket
Bar’s Leaks 15-Minutes Fast Sealing Made in USA Head Gasket Fix
  • Easily seals cracked cylinder heads & blocks
  • Compatible with antifreeze
  • 15 minutes of working time
  • No engine flushing required
  • Prevents overheating
  • Can be used for intake manifold & block leaks, radiator, heater, core, coolant & oil leaks
Our Pick3
best stop leak for head gasket
ATP AT-205 Re-Seal Plasticizer & Conditioning To Stop Leaks
  • Acts as a plasticizer
  • Treat & condition the problematic areas
  • Safe to use on various parts of the engine to prevent leakage
  • Does not contain any petroleum distillates

What Is A Head Gasket?

A head gasket is a crucial part of your engine placed between the cylinder head and blocks to ensure there is no fluid leakage when the engine is running.

It further ensures the oil & coolant do not mix when they flow within the engine for a smooth running process.

Coolant leakage, external leaks, overheating, and oil contamination are some of the most common reasons for a head gasket blow.

Cracks in the gasket are also standard that lead to this mishap. Thus, you need a product that can flow deep into these cracks, harden well and ensure no further issue arises.

What Are The Reasons For a Blown Head Gasket?

A blown head gaster is not a literal term. It simply refers that your engine part is not working as it should. The term can refer to a minor issue to a big one.

One of the most common issues for a troubling gasket is coolant leakage. Apart from this, the high engine temperature is the second most common.

Many people learn about their gasket issues at the very end because they are not familiar with the early signs of the problem.

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If one knows what a particular misfunction is showing, he can save themselves a fortune.

Here we have listed some of the reasons that cause a blown gasket in your ride.

A. Low Coolant Levels

Check the coolant or antifreeze level in your ride. If you are running low, fill your ride up. This is crucial as low coolant means high engine temperature, which is not ideal for your gasket.

Also, if you own an older model, you should check the coolant level by opening the radiator.

Remember, you can do the level checks only when your engine is not hot.

B. Foul Coolant

You need to replace your engine coolant at regular intervals. Old coolant loses its ability over time, meaning your engine can still heat up even with its presence.

So, ensure you do not let a coolant sit in your engine for a long time. Even if you are not using your ride, replace that coolant as suggested by the manufacturer.

Furthermore, if you see your coolant color change or filled with debris, it is also a clear sign for replacement.

C. Worn Coolant Tubes

The tubes through which the coolant moves throughout your engine wear out, leading to complete engine failure.

If the tubes feel squishy or cracked, they need to be replaced.

D. Broken Fan

Your vehicle fan operates with your internal cooling system to keep overheating at bay.

If you find your fan making noise, it can mean it is degrading. Get the issue fixed as soon as possible.

E. Ignoring Engine Overheating

If your engine is frequently overheating, ignoring it can not be good. Continuously using the vehicle even when the engine temperature is in a red zone can lead to a gasket blow-up.

Furthermore, it can lead to other engine damage.

F. Old Head Gasket

Like any other mechanical part, the head gasket needs replacement over time. It too degrades over time.

The older the gasket, the more chances of it getting failed. So, let go of that old part for good.

Things To Consider When Buying The Best Head Gasket Sealer For Duramax

The engine is the heart and the most fragile part of a vehicle. It gets its strength from its various mechanical components.

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If precisely a single part is not functioning well, it can harm your entire engine. Thus whenever buying anything for your machine, you need to be careful.

Buying a gasket sealer is tricky. It can misfire if you do not know what to look for.

Here we have listed some factors for you to go through. A good head gasket sealer must possess them for you to have the worth of your money.

1. Engine Type

The first factor you should consider is your engine type. Both diesel and gasoline engines require different types of sealants.

Thus, check for a product’s compatibility with your engine type before purchase.

2. Composition

Different types of materials and chemicals are used to make a sealer. Some can be good for your engine, while some can be bad.

It might not harm your engine immediately but will ruin it over time. Thus, read if there is any compound used that is not compatible with your motor.

3. Durability

Head gasket sealers are not the permanent solution for the issue. They can help you buy it sometime before you can have it replaced.

Look for a product that can provide you with longevity. Replacing the head gasket is expensive. So, until you can arrange the money, a sealer can help you go by.

4. Usage Ease

A product is only good if it is easy to use. Some products require prior technical knowledge.

Thus, ensure the product you choose is easy to use with clear instructions and does not require professional assistance.

5. Quantity

Sealants come in ounces. You can easily find eight ounces to a couple of gallons. Go for the quantity enough for your troubles.

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It is wiser to carry a small container with you while traveling.

6. Action Time

After pouring the sealant, it is advised not to use the ride for a certain period. It is because a sealant needs time to settle down.

One hour is the least waiting time, and it can even go up depending on the size of your radiator.

So, decide which waiting time is suitable for you.

7. Functionality

Some sealants perform only one task, while others can do more than one thing.

Decide if you want only a head gasket sealer or want more functionalities in a single product.

Lastly, read the product description carefully to understand the functionalities.

8. Customer Reviews

Always look for head gasket sealer reviews before buying. Reading reviews from hundreds & thousands of buyers will tell you if a product is worth your money.

Never go for poor ratings. Also, crosscheck the highly rated product to be sure.

Check Out The 7 Best Head Gasket Sealers Of 2023 With Review & Buying Guide

A head gasket sealer is like a band-aid that can help you get through the issue until you can go for the permanent fix.

Replacing a head gasket is a costly affair. But a good sealant can be your savior. However, it will not work if the damage is too severe. 

When looking for a product, look for its price, online presence, customer reviews, & pros and cons of head gasket sealer.

Below we have reviewed the seven best stop leaks for the head gasket. Each product offers good quality, high durability, brand value, and excellent customer satisfaction.

Explore each product to narrow down the most suited for your head gasket.

1. BlueDevil Permanent Head Gasket Sealer With No Harmful Matter

best head gasket sealer
  • Brand- ‎BlueDevil Products
  • Weight- 2.87 pounds
  • Easy pour-and-go technology
  • Ideal for head gasket, heater core, freeze plug, & radiator repair
  • Compatible with all cooling fluids
  • Offers permanent solution
  • Affordable solution
  • Safe & easy to use
  • Contains no harmful matter

The BlueDevil head gasket sealer is one of the best products you can find on the market. It will repair and seal the leaks in your blown head gasket, heater cores, cracked heads, and freeze plugs.

The product contains no solid or particulate matter that can harm your engine. It is safe to use and is a permanent repair solution.

The product reacts to the temperature differential created by the leak point airflow. That temperature differential acts as the catalyst and helps the BlueDevil to work.

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It is non-clogging, safe to use on heavy-duty engines, compatible with cooling fluids, and guarantees permanent repair.

Pros

  • Prevent coolant & radiator fluids leaks
  • Multiple repair properties
  • Easy to use
  • Compatible with other fluids
  • Guarantees permanent solution

Cons

  • The product may block the cylinder tubes & passages

2. J-B Weld Waterproof Versatile RTV Silicone Black Sealant & Adhesive

best head gasket sealer
  • Brand- J-B Weld
  • Weight- 3.84 ounces
  • Waterproof
  • Designed for sealing & bonding uneven surfaces
  • Does not shrink or crack
  • Resist weathering
  • It can be used on automobiles, metals, rubber, & more
  • Versatile
  • Dependable
  • Affordable

The RTV Silicone Sealant & Adhesive by J-B Weld is another best head gasket sealers designed for sealing and bonding uneven surfaces.

The product has been around the market for over decades, and such a long run tells how well it works.

You can use this product for bonding, sealing, weather stripping, molding, and other automobile-related issues.

It is effortless to use. You need to pour it out onto the leaking area. If you want it to be precise, you can use a tool to get the job done.

Once the sealant is secured, it will form a durable & waterproof seal so that you do face the same problem again in the future.

The best thing about this product is that it does not crack or weather over time.

Pros

  • The seal is robust & waterproof
  • Does not weather out or crack
  • It can be used for numerous purposes
  • Does not affect the sensors

Cons

  • It takes about 24 hours to settle properly and form an unpenetrable seal

3. K-Seal Multi-Purpose Easy-To-Use Permanent Coolant Leak Repair Sealant

best head gasket sealer
  • Brand- K-Seal
  • Weight- 1 pound
  • Offers permanent solution
  • Mixes easily with antifreeze
  • Does not require engine flushing or draining
  • Has multipurpose use
  • Fixes most leaks in water-cooled engines
  • Easy to use- Shake, pour & go
  • Fix the crack & leak issues in the radiator, head gasket, freeze plugs, & more

If you are looking for a multipurpose product, then the permanent coolant leak repair from K-Seal should be on your checklist.

This product is said to offer a permanent solution to your leaking problems. All it takes is a shake & pour, and you are done.

The product easily mixes with all antifreeze and requires no draining or flushing.

This sealer with fixing the cracks & leaks in the radiator, head gasket, cylinder heads, freeze plugs, heater core, and engine blocks.

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The product fixes most leaks in water-cooled engines and guarantees the lifetime of the gasket.

Furthermore, it is better to use this product in the early stages of the issues. The worse the condition, the less effective the sealant will be.

Pros

  • Offers permanent solution
  • Mixes easily with antifreeze
  • Does not require engine flushing or draining
  • Has multipurpose use
  • Affordable

Cons

  • Not ideal for extensive damage

4. Bar’s Leaks 15-Minutes Fast Sealing Made in USA Head Gasket Fix

best stop leak for head gasket
  • Brand- Bar’s Leaks
  • Weight- 1.5 pounds
  • Easily seals cracked cylinder heads & blocks
  • Compatible with antifreeze
  • 15 minutes of working time
  • No engine flushing required
  • Prevents overheating
  • Can be used for intake manifold & block leaks, radiator, heater, core, coolant & oil leaks
  • Made in the USA

For a quick fix for your blown head gasket issue, the Bar’s Leaks block seal is the right product. It is one of the most reliable options available in the market.

The sealant blocks any leaks, seals cracked cylinder heads & blocks, and permanently repairs your blown gasket.

It has a quick set & curing time of only fifteen minutes. You will be done in no time. In addition, this product can be your savior while traveling.

It contains a combination of antifreeze-compatible sodium silicate sealing liquid & various-size gasket-sealing particles that penetrates the cracks & gaps.

The product then hardens to stop the leakage permanently. Furthermore, this made-in-USA product does not need engine flushing.

Pros

  • Cure time is 15 minutes only
  • Effectively seals the cracks & leaks
  • Easy to use
  • Does not require engine flushing

Cons

  • Works well only when instructions are followed
  • Can affect the thermostat functioning

5. Steel Seal Overheating Resolving Head Gasket Fix Repair Sealer For Small To Large Engines

best stop leak for head gasket
  • Brand- Steel Seal
  • Come in a pack of two bottles
  • Works well even at high temperatures
  • Fast working formula
  • Ideal for small to large engines
  • Come with a money-back guarantee
  • Boosts your ride mileage
  • Resolve the issue of overheating
  • Reduce oil consumption
  • Works well with a flushed engine
  • Easy to use

Another permanent solution to your blown head gasket issue is the Steel Seal instant repair solution.

The product claims to permanently seal any crack in your gasket. The package comes in a pair of bottles enough for bigger engines like 8-cylinder ones.

The product comes with easy-to-follow instructions. However, you might need little automotive knowledge to use it.

Whether you have issues like white smoke, engine overheating, watery oil, or external leaks, this sealer can resolve them all.

The best feature of this product is that it is safe to use in both new & older engines. In addition, this sealing agent does not leave any buildup, offer blockage, or any other issues.

It is one of the best head gasket sealers for diesel engines. However, it does work with gasoline engines too.

The only drawback this fast-working solution holds is its high price which can be an issue for various buyers.

Pros

  • Work well even in high temperatures
  • Easy to use
  • Fast working formula
  • Ideal for small & large engines
  • Come with a money-back guarantee

Cons

  • Expensive
  • It may not be compatible with antifreeze

6. ATP AT-205 Re-Seal Plasticizer & Conditioning To Stop Leaks

best stop leak for head gasket
  • Brand- ATP Automobile
  • Weight- 1.76 pounds
  • Easily blends with oils in the system
  • Acts as a plasticizer
  • Treat & conditions the problematic areas
  • Safe to use on various parts of the engine to prevent leakage
  • Does not contain any petroleum distillates

The Re-Seal from ATP Automotive is a professional strength fast-acting sealer highly popular among buyers for its fast-acting properties.

The product works on rejuvenating all rubber seals ad gaskets in the engine, transmission, power steering, hydraulic system, and differentials.

This blown head gasket sealant is compatible with conventional and synthetic oils, gear oil, ATF, power steering fluids, and hydraulic oil.

It contains no petroleum distillates, meaning the seal will not over-swell or break down.

The product can not be helpful for severely damaged gaskets. However, it will reseal most of the leaks within five hours.

Lastly, the easy pour-and-go usage makes this product worth every penny.

Pros

  • Highly rated by consumers
  • Non-toxic
  • Prevents overheating
  • The efficient choice for small leaks
  • Easy to use

Cons

  • Won’t last for a much longer period

7. K&W Permanent Head Gasket & Block Repair Sealant With Nanotechnology

best head gasket sealer
  • Brand- K&W
  • Weight- 1.67 pounds
  • Produced using nanotechnology
  • Deliver permanent seal
  • Compatible with a wide variety of vehicles
  • Does not clog the radiator
  • Come with a two-year manufacturer warranty

The final product on this list is the K&W nanotechnology permanent head gasket and block repair.

The product offers superior sealing capabilities and creates a stronger bond delivering the much-needed permanent sealing effect.

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Using this sealant will not clog your radiator or create any other major issue in your engine. The product requires a coolant flush before application. After that, it is simple, pour and go.

This sealant is compatible with both light and heavy-duty vehicles. It is specially formulated to seal cracked heads or blocks along with the leaks.

Lastly, this item is not compatible with antifreeze. So, be cautious before using.

Pros

  • You get a permanent seal
  • Compatible with a wide variety of vehicles
  • Does not clog the radiator
  • Come with a two-year manufacturer warranty

Cons

  • Not compatible with antifreeze

FAQs About Best Stop Leak For Head Gasket

What is the best head gasket sealer?

If you are suffering from a burnt-out head gasket and are looking for an instant & affordable solution, check out our list below. 

It will help you find some of the best choices available in the market:

  • BlueDevil Permanent Head Gasket Sealer With No Harmful Matter
  • J-B Weld Waterproof Versatile RTV Silicone Black Sealant & Adhesive
  • K-Seal Multi-Purpose Easy-To-Use Permanent Coolant Leak Repair Sealant
  • Bar’s Leaks 15-Minutes Fast Sealing Made in USA Head Gasket Fix
  • Steel Seal Overheating Resolving Head Gasket Fix Repair Sealer For Small To Large Engines
  • ATP AT-205 Re-Seal Plasticizer & Conditioning To Stop Leaks
  • K&W Permanent Head Gasket & Block Repair Sealant With Nanotechnology
Is using head gasket sealers safe for your engine?

Using a good quality sealer is always safe. Premium products are made to ensure it work efficiently while keeping the machine safe.

All you need to do is look for the one to go with your gasoline or diesel engine.

Is going for gasket sealers instead of replacement a good idea?

Choosing the two options entirely depends on your damage level. If you have minor leakage & fine cracks, then a sealant is a good choice. Otherwise, replacement is your only option.

How long does the head gasket sealer last?

Different products offer different levels of longevity. Some can last for days, some for weeks, and some for months.

Furthermore, longevity also depends on the severity of your head gasket damage. The bigger the damage, frequent the application.

Can a sealant cause a clog in the engine?

There are chances that a product might cause your engine to clog. Sealants work by filling up the gaps in the leaks. 

But sometimes, if the settlement does not happen properly or you do not give the solution proper time to settle, such a thing can happen.

Conclusion

One of the best ways to secure your blown head gasket from getting worse is to find a good-quality sealant, and our list of seven best head gasket sealers in 2023 can help you with the task.

We hope you find this article helpful in your purchasing journey. Which is your favorite pick from the list?

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