The 10 Best Gasket Sealers for Your Car – Reviews & Buying Guide

Best Gasket Sealer

As cars age, gasket issues come up naturally and you'll often get the chance to either change it out completely or use a sealer to keep it functioning properly.

Gaskets have the simple job of preventing leaks between two joined surfaces, and this ranges from a simple connection to more complex gaskets like the head gasket of a car's engine.

In this gasket sealers review, you'll get a list of the best offers in the market, plus a buyer's guide to help you know the important aspects to watch out for when making your choice.

10 Best Gasket Sealers - Reviews

Image

Product Name

Size

Container

Rating

Current Price

Permatex 81160 Red RTV Silicone Gasket Sealer

1. Permatex 81160 Red RTV Silicone Gasket Sealer

3 oz

Tube

4.6

Gasgacinch 440-A Belt Dresser & Gasket Sealer

2. Gasgacinch 440-A Belt Dresser & Gasket Sealer

4 oz

Can

4.6

Permatex 80062 Gasoline-Resistant Gasket Sealer

3. Permatex 80062 Gasoline-Resistant Gasket Sealer

4 oz

Can

4.5

3M 08672 Ultrpro High-Temperature Silicone Gasket Sealer

4. 3M 08672 Ultrpro High-Temperature Silicone Gasket Sealer

3 oz

Tube

4.6

Edelbrock 9300 Gasgacinch Gasket Sealer

5. Edelbrock 9300 Gasgacinch Gasket Sealer

4 oz

Can

4.4

Steel Seal Pour-In Blown Head Gasket Sealer

6. Steel Seal Pour-In Blown Head Gasket Sealer

16 oz

Bottle

3.5

Bar's Leaks HG-1 Head Gasket Repair Formula

7. Bar's Leaks HG-1 Head Gasket Repair Formula

34 oz

Bottle

3.6

Bar's Leaks 1111 Head Gasket Fix

8. Bar's Leaks 1111 Head Gasket Fix

24 oz

Bottle

3.6

K&W 401232 Head Gasket Sealer Using Nano-Technology

9. K&W 401232 Head Gasket Sealer Using Nano-Technology

32 oz

Bottle

3.6

BlueDevil 32-Ounce Head Gasket Sealer

10. BlueDevil 32-Ounce Head Gasket Sealer

32 oz

Bottle

3.3

1. Permatex 81160 - Quick Curing Formed-in-place Silicon Gasket Maker

Editor's Rating: 4.6 out of 5 stars (4.6 / 5)

Permatex 81160 Red RTV Silicone Gasket Sealer
  • Size: 3 ounces
  • Container: Tube
  • Setting Time: 1 hour

There are many ways to seal a leaking gasket. You can either use a conventional sealer or you can use a gasket maker like this one from Permatex.

You simply cut its nozzle and apply a continuous bead around the area that needs a gasket, and on one part only. Then, assemble the parts together and leave to set.

It's made from silicone and sets in just one hour, after which you can tighten it. You'll have to wait for 24 hours before introducing fluids into the part though because that's how long it takes to fully cure.

The downside of this formula is that it's not sensor safe and it's also not gasoline safe. So it's kind of limited in its scope of application, but it's great for making your own gaskets on the fly.

Pros:

  • Simple and easy to use silicone gasket maker
  • Ideal for high-temperature applications up to 650 degrees F
  • Sets in just 1 hour and fully cures in 24 hours
  • Resists all fluids and oils except gasoline

Cons:

  • Not for use on parts with gasoline contact
  • You have to use it to make a new gasket
  • It's not sensor safe

2. Gasgacinch 440-A - Best-selling Gasket Sealer Since Decades

Editor's Rating: 4.6 out of 5 stars (4.6 / 5)

Gasgacinch 440-A Belt Dresser & Gasket Sealer
  • Size: 4 ounces
  • Container: Can
  • Setting Time: N/A

Gasgacinch 440-A is another top-rated gasket sealer and it has been around for decades. Unlike most hard-curing sealers in the market, this one remains flexible after application and this brings lots of advantages.

Remaining flexible, for instance, makes it easier to assemble and disassemble an engine. Secondly, you can simply rub this sealer's residue away, making it one of the most user-friendly gasket sealer formulas.

You can use it on all kinds of metallic surfaces, including aluminum, carbon and alloy steel, magnesium, lead, titanium, copper, and even natural rubber and cork.

It's also resistant to high heat, gasoline, and all kinds of oils. When cured, it has high peel strength, high shear strength, and it's resistant to vibration dampening and fatigue. You can use it for belt dressing as well.

Pros:

  • High-quality properties ideal for radiators and head gaskets
  • Remains flexible after application and curing
  • Resistant to gasoline, high heat, and oils
  • Works well on many metals, rubber, and even cork

Cons:

  • Does not come in an easy application tube
  • It costs slightly more but it's worth it

3. Permatex 80062 - Gasoline-resistant Gasket Sealer that Sets in Minutes

Editor's Rating: 4.5 out of 5 stars (4.5 / 5)

Permatex 80062 Gasoline-Resistant Gasket Sealer
  • Size: 4 ounces
  • Container: Can
  • Setting Time: Few minutes

Permatex makes good gasket sealers, as you can see from this offer. It comes with an impressive formula that sets in just minutes, making it easy to carry on with your work.

In addition to being fast drying, it also dries to a non-brittle film and it remains reliable for a long while.

As one of the best gasket sealants for general purpose use, this sealant resists an impressive temperature range between -65 and 500 degrees Fahrenheit.

One con is that you'll need lacquer thinner or any similar stuff to remove it. Not too bad anyway, if you just want a gasket sealer that cures as fast as possible.

Pros:

  • Fast-drying all-purpose gasket sealer
  • Resistant to temperatures from -65 up to 500 degrees F
  • Resists gasoline, kerosene, anti-freeze, propane and lots more
  • Sets in just minutes, so you can get on with your work

Cons:

  • Can only be removed with lacquer thinner
  • Does not come in an easy application tube

4. 3M 08672 Ultrpro - Silicone Sealer Sets in Minutes & Resists up to 600F

Editor's Rating: 4.6 out of 5 stars (4.6 / 5)

3M 08672 Ultrpro High-Temperature Silicone Gasket Sealer
  • Size: 3 ounces
  • Container: Tube
  • Setting Time: Few minutes

The 3M 08672 is one of the best silicone gasket sealers in the market, with an easy to use design and a fast setting time of fewer than 10 minutes.

It's non-corrosive and can either be used as a gasket dressing to improve a weak gasket or used entirely on its own without a gasket.

One downside is that it's not gasoline resistant. It's however, resistant to coolants, oil, and water. It's also safe for use with oxygen sensors.

This sealant will stay flexible after curing while withstanding temperatures up to 600 degrees F, but only intermittently. One last nice feature is that you can start the engine just 15 minutes after the application.

Pros:

  • Flexible gasket sealer is easy and efficient
  • Sets almost immediately with the engine started in 15 minutes
  • It is oxygen-sensor, water, and oil-safe
  • Withstands temperatures up to 600 degrees F

Cons:

  • It's not resistant to gasoline
  • The price is comparably higher than others

5. Edelbrock 9300 - Water & Oil-resistant Gasket Sealer

Editor's Rating: 4.4 out of 5 stars (4.4 / 5)

Edelbrock 9300 Gasgacinch Gasket Sealer
  • Size: 4 ounces
  • Container: Can
  • Setting Time: N/A

Edelbrock began in 1938 and has continued to produce a variety of automotive products, including gaskets, camshafts, air filters and so on, since then.

This offer is for 4-fl oz can with an oil and water-resistant formula. It's however, not gasoline resistant, so this reduces the areas that you can apply it on.

You can use it for the water pump, valve cover, and oil pan gaskets. Although there are cheaper offers, it comes with a reliable and long-lasting formula.

Pros:

  • Reliable gasket sealer and belt dressing
  • Water and oil-resistant formula
  • Universal sealer for all purposes except gasoline parts
  • Easy to clean out

Cons:

  • It's not gasoline safe
  • Removing it needs an extra effort
  • There are cheaper offers

6. Steel Seal 8CYL001 - DIY Pour-in Head Gasket Fix

Editor's Rating: 3.5 out of 5 stars (3.5 / 5)

Steel Seal Pour-In Blown Head Gasket Sealer
  • Size: 16 oz
  • Container: Bottle
  • Setting Time: Few Minutes

Once you start getting the different signs of a blown head gasket from your car, like white smoke from the tailpipe, water in the car's oil, or a constantly overheating engine, then it's usually time to change the head gasket.

However, this is usually expensive because a mechanic has to work on your car's engine to change the blown head gasket. You could get the same sealing results for a much cheaper price though.

Steel Seal offers you one of the best liquid gasket sealers in a bottle. Simply follow the instructions to pour it in and your leaking head gasket will leak no more in just a few minutes.

It's so simple to use and comes with both a 30-day money-back guarantee and a lifetime replacement warranty. You can use it for sedans, vans, pickups, SUVs, trucks and even bikes.

Pros:

  • Easy-to-use bottle to repair blown head gaskets
  • Works on all engines up to 8 cylinders
  • A fast solution used by professionals
  • Comes with a lifetime replacement guarantee

Cons:

  • It's a relatively costly product
  • Such repair sealers are not always guaranteed to work

7. Bar's Leaks HG-1 - Guaranteed to Seal Blown Head Gaskets Permanently

Editor's Rating: 3.6 out of 5 stars (3.6 / 5)

Bar's Leaks HG-1 Head Gasket Repair Formula
  • Size: 33.8 fl oz
  • Container: Plastic bottle
  • Setting Time: 45 minutes

Bar's Leaks has made leak-repair products for 70 years and offers you this head gasket repair formula as proof of the company's impressive experience over the years.

It needs just 45 minutes of your time to fix the leak and your car will stop showing signs of a blown head gasket. Bar's Leaks also guarantees that the repair is permanent and backs it with a lifetime warranty.

This formula has a carbon fiber reinforcement to quickly and tightly seal any cracks in your car's engine block or head.

Being anti-freeze compatible means you don't even need to flush your car engine's cooling system after applying this formula. This makes it an easy-to-use wonder formula.

Pros:

  • Impressive formula to repair blown head gaskets
  • Can easily save you thousands of dollars in head gasket repair costs
  • Package includes detailed instructions for correct usage
  • Comes backed by a lifetime warranty

Cons:

  • There's always the chance that it might not work
  • You need to follow the instructions to the letter

8. Bar's Leaks 1111 - Needs Just 15 Minutes to Plug Your Engine Leaks

Editor's Rating: 3.6 out of 5 stars (3.6 / 5)

Bar's Leaks 1111 Head Gasket Fix
  • Size: 24 oz
  • Container: Plastic bottle
  • Setting Time: 15 minutes

You can also try this product if you are looking for the best engine gasket sealer for your car's blown head gasket. It also comes from Bar's Leaks and is also a 1-step solution.

The difference here is the lack of carbon fiber reinforcement and this makes this formula not as strong as the HG-1 from Bar's Leaks.

On the positive side, it costs less than the HG-1 and is even a faster-acting formula as well. Both products are great at what they do and they come from a well-known company, so, it's left for you to make your choice between the two.

Pros:

  • Fast-acting head gasket fix pours directly into the radiator
  • Anti-freeze compatible solution needs no draining
  • Comes in a large 24-oz bottle for all engine sizes
  • The package includes detailed instructions to make it work

Cons:

  • It's not as effective as the earlier product
  • May or may not work

9. K&W 401232 - Comes with a Double-Money-back Guarantee

Editor's Rating: 3.6 out of 5 stars (3.6 / 5)

K&W 401232 Head Gasket Sealer Using Nano-Technology
  • Size: 32 fl oz
  • Container: Bottle
  • Setting Time: N/A

Here's another permanent head gasket repair formula. It uses nano-technology to create bonds and seals that are very strong and long-lasting.

It works on engine blocks, radiators, cooling systems, and more, with K&W being so sure of its high quality that it offers a Double-Money-Back guarantee on this offer.

The downside is that this formula is not compatible with anti-freeze, so you need to flush your cooling system first before using this gasket sealer.

Pros:

  • Universal & head gasket repair formula
  • Uses nano-technology to form strong seals
  • Works on all types of engines
  • Formed seals are able to withstand extreme heat and pressure

Cons:

  • The formula is not compatible with anti-freeze
  • Its application is more complex than Bar's Leaks products

10. BlueDevil 38386 - Completely Safe Head Gasket Sealer

Editor's Rating: 3.3 out of 5 stars (3.3 / 5)

BlueDevil 32-Ounce Head Gasket Sealer
  • Size: 32 ounces
  • Container: Plastic bottle
  • Setting Time: N/A

This 32-ounce offer from BlueDevil is also one of the best gasket sealers in the market. It offers you a simple method of sealing a blown head gasket that would otherwise cost plenty of money.

You get a solution that has no solid particles and that is completely safe for engines. It works on a range of parts, including warped or cracked heads, leaking freeze plugs and heater cores.

BlueDevil offers a 90-day money-back guarantee on this gasket sealer, but you'll need to flush your engine's cooling system before applying it since it's not compatible with anti-freeze.

Pros:

  • Offers a permanent head gasket repair
  • Completely safe with zero particles to harm the engine
  • Also repairs heater cores and warped heads
  • Comes with a 60-day money-back guarantee

Cons:

  • You'll need to flush the radiator first
  • It may or may not work

How to Buy the Best Gasket Sealers​

How to Buy the Best Gasket Sealers

Once you notice a gasket issue in your vehicle, especially a head gasket problem, then you can either decide to change the gasket completely or to use a sealant, which is often the more affordable option.

Although it might seem that a gasket sealer is just a gasket sealer, there are slight differences between the different offers out there in the market.

In order to understand these differences and be able to make an informed decision, you'll need to consider the following factors when making your choice.

#1. Compatibility

One important factor you should consider when choosing a specific gasket sealer is that sealer's compatibility with that specific part of your car's engine.

For instance, some gasket sealers can easily get dissolved by gasoline, so you can't use them in the head gasket or in any other situation where it might come in contact with gasoline.

Others get formulated for heavy-duty use or high-temperature applications, while some sealers harden after application, with others remaining flexible permanently.

#2. Head Gasket Sealer vs Replacement of the Gasket

The head gasket is the most important gasket in a car because it keeps the engine running smoothly and reliably. If your car's head gasket fails, then you can either use a sealant or completely replace it, depending on the situation.

Signs of head gasket failure is usually overheating, whitish exhaust smoke, and steadily depleting coolant levels.

If the head gasket is completely damaged or blown, the best solution is often to change the gasket, especially if the engine is leaking much, because even the best gasket sealer won't be of much help here.

A slightly damaged head gasket, however, can get some help from a gasket sealer if the leak isn't significant. Using a gasket sealer is the cheaper solution, although it's sometimes a temporary solution to the problem.

#3. Waiting Time

Different gasket sealers work in different ways, with some needing some time to work, while others need none at all. You'll have to keep these differences in mind and check the gasket for manufacturer's instructions.

Most head gasket sealers, for example, need more time to do their work than other sealers. There are also formed in place gaskets that may need up to 24 hours to cure.

#4. Ease of Application

This is another issue that you'll have to decide how important it is to you because different sealers come in different types of containers and have different methods of application.

While the manufacturer will try to make each sealer as easy to apply as possible, it's still left for you to decide if it's something you can work with or not.

Conclusion

We've reached the end of this gasket sealers review and you've seen the list of the top offers in the market above, including the simple sealers and the more complex head gasket repairers.

As you'll understand by now, the best sealer for your car depends on the problem and how you wish to solve it. So, your last choice depends completely on you and your situation.