Does Head Gasket Sealers Work?

Head gasket, the thin metal separating the cylinder head of your motor’s engine from its engine block is an important piece of your motor’s engine that raises no concern until it blows up or fails. When this happens, fixing the failed head gasket of the vehicle will cost money. 

So, you ask can I repair my car’s damaged head gasket with a head gasket sealer. Will the head gasket sealer work? What causes the head gasket failure in the first place? Rest easy. These and more will be reviewed in this article. So, let’s get going.

Head gaskets? What exactly are they? What do they do? 

Your motor’s head gasket is the metallic seal linking the cylinder head of the upper part of the engine and the engine block below. It functions to meet the sealing needs of the cylinder head and the engine block by stopping any leakage between the two parts during the compression process.

As your motor’s engine goes through its internal combustion, the head gasket forms a seal that prevents the mixing of the oil and water from moving through the two chief frameworks of your car’s engine. That is the engine block and the cylinder head.

 It does this by protecting the route of the oil and that of water which serves as the coolant so both can freely travel through the engine’s length without interfering with one another during the compression and combustion process.

Now, when the head gasket fails either by perforation on the head gasket or overheating of the car engine it results in a fault in the sealing function of the head gasket. This may lead to a blend of water and oil which is terrible for your car’s engine.

What is a Head Gasket Sealer?

A Head gasket sealer is a chemical fluid that when poured on the radiator looks for the dents, cracks, perforations, and damages on the head gasket and corrects them. However, oftentimes it is only but a short-term fix. 

Does Head Gasket Sealer Work?

In most cases, if the head gasket was broken due to overheating of your motor’s engine, a head gasket sealer may not be of much help. However, knowing that replacement consumes lots of money you may give the head gasket sealer a try if the hole on the head gasket is at the connection of your engine’s combustion chamber and the coolant. This should help lengthen the duration of the head gasket. Ensure to confirm the fix by checking to see that the white smoke has stopped.

Pros of a Head Gasket Sealer 

a. It is economical: 

Compared to exchanging an old head gasket for a new one, using a head gasket sealer for a fix is pounds. It saves you the cost of getting a new gasket and paying a skilled worker for its installation.

b. Head gadget sealer is a quick fix: 

Another advantage to a head gasket sealer is that you don’t have to be an automobile mechanic to use it. If you are careful to read through the head gasket sealer manual before using it and you use it as recommended then you are good to go. It swiftly goes to work, saves your time and you don’t have to break a sweat.

Cons of a Head Gasket Sealer

i. Head gasket sealers are provisional: 

One drawback they have is their short-term fix. Sealers don’t provide an enduring solution to the hole on the head gasket. Sure it works for the time- being, however, you would need a new head gasket later.

ii. You risk having a clogged radiator: 

If you apply head gasket sealers whilst ignoring directions on use, you may end up clogging your radiator thus causing more harm.

How long is the Effect of the Head Gasket Sealer?

The timing differs based on the type of head gasket sealer used and the brand bought. Some sealers may stay effective for two weeks and others two years and yet another six months. However, one thing is sure to head gasket sealers do not have a permanent effect.

How much does Head Gasket Sealers Cost?

Generally, the head gasket sealers cost between 20 to 100 dollars depending on the brand. Compared to the 1000 to 2000 dollar cost of a new gasket, a gasket sealer is way cheaper. 

Is the use of a head gasket sealer preferred to buying a new head gasket?

This depends on your current budget and the extent of the damage and the cause of the damage. If the blow on the head gasket was caused by overhead, you will need a new head gasket. However, if it is not a major hole a sealer will do the gasket a temporary good.

Is an expensive head gasket sealer synonymous with more effect?

Not really. Head gasket sealers usually function in the same way. However, some brands may be more effective than others.

How do Head Gasket Sealers Work?

For a head gasket sealer to function you’d have to turn it inside the radiator. Start your car engine and leave it running for about 20 minutes. This ensures the cooling chamber still works properly. With the running engine and the functional coolant, the heat generated activates the sealant to find and fix the fault 

Why do Head Gaskets Failure Happen?

A head gasket leak may be due to a fault in the gasket structure and not necessarily because of something you did or did not do. However, sometimes it may be because you abandoned caring for your car’s engine coolant. When coolants are neglected for long, it causes an accumulation of rust which chops through head gaskets thus resulting in leaks.

How to Identify a Head Gasket Leak?

There are several signs associated with head gasket failure. They include but are not limited to; fast and continuous engine overheating, when the tailpipe gives off white smoke, drying up of the coolant chamber, low level of water on the coolant, and oil in the engine despite a topping and a blend of water with the oil.


A head gasket sealer is good if you are on a close budget and the failure of the head gasket is minor but its effect is only provisional.