Best Sound Deadening Spray For Cars

Buyers Guide, Soundproofing

best sound deadening spray for cars
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In this post, I’ll walk you through the various aspects of sound-deadening sprays for cars to help you make an informed buying decision.

Moreover, I’ll also throw light on important parameters that can influence your buying decision.

Lastly, I’ll answer quite a few questions related to sound-deadening sprays asked by my clientele as well as readers.

Who doesn’t like a noiseless ambiance inside the car, right?

I love to travel when I’ve free time and mostly I prefer the car as my mode of travel.

If you’re like me then definitely you would be quite familiar with the importance of the sound-deadening car.

It not only provides you the epitome of silence but also, the luxury of listening to your favorite songs without any external disturbances such as road noise, etc.

However, it would be completely wrong to say that sound-deadening sprays are the only way to sound-deaden cars.

Another very popular method to sound deaden a car is using soundproof mats.

Dynamat, HushMat, FatMat, Noico, Lizard Skin, SounSkins, etc can also be used to sound deaden a car effectively.

Nonetheless, our discussion will revolve around the sound-deadening sprays only in this post.

So, without any further ado, let’s begin.

As the name suggests, sound-deadening spray allows you to sound-dampen cars, machines, and other household appliances by covering them in layers of liquid soundproofing material.

The good thing about these soundproof sprays is that they are cheaper, easy to use, and highly effective as well.

 However, if you’ve used any soundproofing material or sound-absorbing material before then you’ll agree with me that even after installing soundproofing materials in your car or appliance, you’ll find that some gaps got created between these soundproofing materials and these gaps can adversely impact the performance of the soundproofing materials. 

So, what’s the solution?

Here, come into play the sound-deadening sprays.

These sprays are in great demand among car owners who want a quick and effective solution.

However, the way you implement these sprays on your car’s interior also plays a crucial role in the overall sound deadening of your car.

I’ve seen first-time buyers applying only one layer of spray and assuming that the external noise will be fully blocked, but the fact is, the spray doesn’t work that way.

For optimum result, you’ll have to add multiple layers of these sound-deadening sprays else it will not be able to match the sound-deadening capabilities of mats, foams, and insulations.

So, now you know in what quantity these sprays need to be applied, allow me to throw light on what is it made of.

Definitely, sound-deadening sprays are made of soundproofing materials.

These sprays are made of the liquid version of mass-loaded vinyl sheets.

If you’ve never heard about mass-loaded vinyl then let me tell you, they are more effective as well as expensive than soundproof mats.

On top of that, these sprays are resistant to heat which is not the case with most of the sound-deadening mats other than Dynamat.

Does Sound Deadening Spray Work in Car?

Definitely, the sound-deadening spray works well for the car.

Trust me, if these sprays weren’t effective in dampening external noises such as road noise, then would I writing such an elaborative post on this topic?

I hope you got the answer about the effectiveness of these sprays.

Now, without wasting any time, let’s have a quick look at the working method of sound-deadening spray.

It would be great if you had some prior knowledge of sound waves because it would help you to understand in and out of these sprays without any problem.

However, if you’re new to the soundproofing domain, then allow me to help you go through the soundproofing basics.

The sound ecosystem comprises of source, destination, and mode of transmission such as air, water, etc.

When we talk of the source of sound waves then it could be any vibrating object.

Once the wave is produced it travels from the source to the destination using a medium such as air.

Now, it is the duty of sound-deadening material to either absorb the sound waves or reflect them back, so as to make the car free from external noise.

Do you know that the liquid foam sound deadener can block the transmission of ultrasound frequencies entirely?

If you’re wondering that the aforementioned principle is only used by sound-deadening spray then you’re absolutely WRONG.

In fact, irrespective of the soundproofing materials, the principle remains the same.

Best Sound Deadening Sprays Review

Well, here comes the list of the best sound-deadening sprays for cars.

All the products that made it to our list have been evaluated on certain parameters by our testing team.

However, the sprays are in random order, and for us, all the sound-deadening sprays that were made to our list are highly effective and of top-notch quality.

Hope you enjoy the show.

LizardSkin 50115 Sound Control Ceramic Insulation

It goes without saying that LizardSkin is one of the top-notch sound-deadening sprays for cars.

Over a period of time, the company has been successful in gaining credibility as well as people’s trust.

It’s not an overnight success for the LizardSkin brand rather it has matched the end-users’ expectations time and again.

Enough of bragging, let’s have a quick look at some of the idiosyncratic features that may entice you to take home this superlative sound-deadening spray for cars.

best sound deadening spray for cars

In fact, the company has three different sprays for the offering to help you achieve the optimum result.

First and foremost, you need to apply their thermal insulation spray which is meant to deal with high temperatures.

Then, apply the sound control spray which is the one that will combat the external noise and will help you achieve the epitome of silence.

Lastly, apply the top coat which is meant to seal everything and provide an additional layer of protection.

However, sound control spray alone can do the work for you.

I’m not saying this just because I’ve used this spray quite a few times but because the users’ reviews were highly positive and even the manufacturer’s website shows a great ray of hope, indeed.

Needless to say, users’ reviews and the experiment by my team were definitely helpful in determining the efficacy of the product.

So, let’s dig a bit more into the product.

As the name suggests, the product comprises liquid ceramic insulation which is meant to perform extremely well in a hot and humid environment.

Here, I would like to bring to your notice that there are only a few mats such as Dynamat which are known to perform well in a hot climate.

Even most of the mats will produce a rubbery scent in hot temperatures and make you uncomfortable.

Though I’m not raising any questions about the potential of mats, definitely, they are definitely a long-term solution to external noises.

To make a long story short, LizardSkin once sprayed will leave a thin overlay on top of sheet metal in your car.

This thin overlay acts as an additional layer of protection and protects your car from scratches as well as water which is definitely a great value addition.

On top of that, the manufacturer claims that the spray is fire-resistant, non-toxic, and environment-friendly.

In short, you’ve got all the reasons for buying this product.

Unlike other sprays which may create some sort of problems when you’re willing to remove them, this spray can be removed hassle-free with the help of soap and water.

So, cleaning the overlay created by LizardSkin spray isn’t a problem at all.

Don’t get confused that it is lightweight so it will not be as effective as its competitors which are a bit heavy.

In fact, the product is highly effective in spite of being one of the lightest sound-deadening sprays for cars available on the market.

The spray is black in color so the probability is quite high that it will sync well with the color of your car.

I can say with full confidence that the LizardSkin sound-deadening spray is as effective as some high-quality mats if NOT MORE.

A thin envelope that it makes over the metal sheet prevents vibration to some extent in a similar way as a mat would do.

Definitely, the users are quite vocal about its ability to dampen external noise such as road noise.

Lastly, neither I’m trying to convince you nor am I telling you to believe my words.

(You can check on Amazon what consumers have to say.)

Design Engineering 050220 Boom Mat Spray-on Sound Deadening

Boom Mat Spray is well-known to dampen a car’s vibration as well as bock external sounds such as road noise.

The claims made by the manufacturer bring the product to par with the sound-deadening mats.

I’ve used it quite a few times and found the audio quality to improve drastically.

The product gives you good coverage, an 18-ounce can cover around 20 feet square which is definitely a mindboggling claim in itself, isn’t it?

best automotive spray sound deadener

Trust me, I tried this sound-deadening spray on my cars just because I was fascinated with the claims that the product makes.

In short, you’ll find a tangible difference in the vibration as well as noise.

For optimum results, I highly recommend multi-layering your car with this sound-deadening spray.

3 layers would be fine as per my experience.

Since I’ve tried both LizardSkin as well as Boom Mat sound-deadening sprays for my car, I may be the RIGHT PERSON to enlighten you with my view, right?

In one word, I’ll vouch for LizardSkin.

However, this is solely my perception and view and it has nothing to do with which sound deadener spray is better.

Indeed, it is possible that you may prefer Boom Mat over LizardSkin.

On the downside, Boom Mat is known to emit a rubbery scent which is quite obvious since it is a rubber-based product.

Nonetheless, you’ll experience such odor only when the temperature rises in the vicinity of the spray.

If you had used asphalt-based sound-deadening mats then definitely you would’ve found a similar odor, right?

The spray is affordable and is available in cans of 18 ounces.

Remember, the product is a pressurized can, so the manufacturer includes a “flammable warning” on the can to apprise you about the potential danger.

The feature of Boom Mats Spray-on that grabbed my attention is its ability to get dried in just 6 hours.

Moreover, if you’re looking for a quick solution to the car’s squeaks, and rattles, then definitely, I would suggest, you should give Boom Mats spray-on a try.

You can go ahead and apply this spray-on on non coated surface.

For the optimum result, I highly recommend you to topcoat the spray-on with paint.

Lastly, you don’t have to worry too much about the temperature because the manufacturer claims that the Boom Mats is capable of handling temperatures up to 300 degrees Fahrenheit.

If you convert the Fahrenheit to Celsius then it would come around 148.889 degrees Celsius which is definitely a good threshold.

Does it sound good?

(Check the current price on Amazon)

3M 03584 Professional Grade Rubberized Undercoating

3M Professional Grade Rubberized Coating can be used on your cars, trucks, and other similar vehicles where your top-notch priority is to enhance audio quality inside the vehicle as well as dampen the external noise.

best spray on sound deadener

On top of it, the black coating helps to protect your vehicle from corrosion.

Since the outcome of the spray is a textured finish, you can expect the coating to be highly resistant against chipping, abrasion, exterior rusting, and weathering.

In short, you’re getting lots of add-ons when you’re buying this product.

If we talk in terms of convenience, then definitely this product has an upper edge as you don’t have to invest a single dollar in any equipment.

So, all you need to do is, buy the product and spray it on your car, and you’re good to go.

On top of it, the company emphasizes that the product is highly capable of protecting the underside of your vehicle from corrosion which is known to the ones that get corroded first.

What do you think about the extra protection that you’re getting at no extra cost?

It comes in a can and 16 ounces of 3M undercoating covers an area of 6 square feet.

On the downside, you can’t negate the probability that it will not emit any odor as it is asphalt-based.

Again, comparing its performance with high-quality mats is a question mark.

If you have read thoroughly till now then you can very well infer that the primary aim of this product is to provide an undercoating and NOT soundproofing car.

Furthermore, unlike LizardSkin, 3M coating is a bit difficult to get rid of, so you need to remove the undercoating in the presence of a professional expert if you’re doing it for the first time.

The outcome of sound-deadening sprays for cars depends to a large extent on the implementation of the installation process in the correct way.

Well, you don’t have to worry at all if you’re not aware of the best way to apply spray-on.

In the later part of this post, I’ve discussed all the steps in the simplified form for your better understanding.

(Check the current price on Amazon)

GT Liqui-Damp 1 Gallon Liquid Car Sound Deadener Kit Noise Insulation Dampener

GT Liqui-Damp car sound deadener performs really well in case you’re having trouble with road noise, rattling, noise from the panel, etc.

Unlike the previous spray-on where I consistently talked about implementing multiple layers of coating, the GT Liqui-damp is capable of enhancing the audio quality to almost twice by simply applying a single layer of it, amazing, isn’t it?

best automotive sound deadening spray for cars

Moreover, if you’re on a shoestring budget then definitely you should this sound deadener as it comes at almost half the price of the market leader.

Even though you’re a first-time buyer you can expedite the installation process on your own without any professional help because the kit comprises almost everything that one will need.

To make the entire process hassle-free for you the kit comprises of easy to follow instructions as well.

However, if you still have some doubts related to the installation you can consult tech support which is free of cost.

All you need to do is to dial the toll-free number provided by them.

I’m assuming we’re on the same page so moving further we’ll have a quick look at what can we expect from this sound deadener.

This water-based liquid sound deadener is non-toxic and non-hazardous as well, so you don’t have to worry about your small kids at all.

A standard coat is approximately 32 mils thick and within an epigrammatic span of time the product settles well.

Drying wouldn’t take more than 2 hours at all.

The product can be applied to both painted as well as rough surfaces.

One gallon is capable of covering an area of 75 square feet at a thickness of 32mil which is definitely something to brag about.

Applying two coats will serve your purpose and I highly recommend that you shouldn’t increase the thickness of the coat because it may lead to cracking as well as clumping.

So, in short, let the thickness be of standard mils and apply at least two layers of coating to see some tangible result.

(Check the current price on Amazon)

Pros and Cons of Sound Deadening Sprays

The sound-deadening spray has its own pros and cons, and it is quite obvious that the cons may influence your buying decision.

So, as an authority in the soundproofing domain, it is very important for me to update you with all the necessary information about the sound-deadening spray.

To cut a long story short, I’ll be discussing the benefits as well as flaws of sound-deadening materials to help you decide which of the two you prefer.

If we talk about the sound-deadening mats then definitely Dynamat is the market leader.

Definitely, you can raise a question on its noise-dampening capability but they aren’t FREE from all the problems.

The credit for sound-deadening mats being so effective goes to their thickness.

But, many of you wouldn’t be aware of the fact that the thickness of Dynamat becomes the hurdle when it comes to cutting it properly.

You may not believe my words but the fact is many newcomers even injured themselves in cutting Dynamat.

Secondly, positioning Dynamat into your car’s door or other places would become extremely difficult if you’re not able to cut them properly.

However, if you’re using sound-deadening spray, you don’t have to cut or position anything.

All you need to do is, simply spray multiple layers of the spray in your car to get rid of the noise.

If you would’ve never used a sound-deadening mat then let me tell you, these mats come with an adhesive layer that can be difficult to navigate.

Placement of a sound-deadening mat is not only the thing that is difficult.

Even removing these soundproofing mats from your car would be a tedious task because of the presence of an adhesive layer.

 The biggest problem that I’ve found with the mats is that the low-quality ones get oxidized in the presence of moisture which can damage the sheet metal of your car. 

Nonetheless, if you’re using a sound deadener spray, then you don’t have to worry at all about your car’s metal sheet.

Moreover, installing a sound-deadening mat in your car is a tedious and time-consuming process.

On the contrary, sound deadening spray allows you to cover your entire car completely as well as evenly in a couple of minutes.

How many of you are aware of the fact that two gallons of liquid deadener will cover about 47 ft2 at 42 mils or 1mm thickness?

As soundproof consultants, we generally use the price-to-quantity ratio to compare liquid sound deadener effectiveness and affordability against Dynamat.

Sound Deadening Sprays vs. Mats

ParametersSound Deadening SpraysMats
Product TimespanThey are short-duration solutionsDefinitely, they are long-term solutions
Installation timeJust a couple of minutesAt least, a couple of hours
Removal difficultyNo need to removeHighly difficult
Level of difficultYou can easily spray it on the corners, and other unique placesCovering corners, rough edges could be quite strenuous
Unpleasant OdorThey leave a rubbery scent after the sprayCovering corners, and rough edges could be quite strenuous

Car Soundproofing Spray Installation Process

Well, the car soundproofing spray installation process is quite simple and even though you’re a newbie you can do it on your own.

Unlike mats such as Dynamat where you may need professional help for its cutting and installation, car soundproofing spray can be easily applied on the corners, rough surfaces, and other places.

Even car soundproofing spray is easier to apply as compared to foam and insulation.

If you think that simply applying to some surfaces or even the entire car will serve the purpose, then it’s high time that you read the steps that we’re gonna discuss soon.

Prepare your Vehicle before Applying Sound Deadening Spray

Similar to mats, in the case of car soundproofing spray, your first goal should be to reach the metal sheet of your car.

Remember, the spray doesn’t oxidize your metal sheet even in wet conditions.

If you’re an avid reader of this blog, then you could easily recall the Dynamat installation that we had discussed previously wherein we’ve also talked in detail about the critical areas such as doors that are difficult to soundproof.

Furthermore, soundproofing your car’s door would involve the removal of the headliner, seats, and carpets before installation.

On the other hand, the hood, trunk, and roof are some of the easiest locations to be soundproofed.

For the optimum result, you need to clean the metal sheet very carefully.

Even a few specks of dirt, dust, or rust may degrade the spray performance.

I highly recommend you, sand down the metal sheet to clean it from rusts and clouds of dust.

If the result is not as per your expectation after you expedited the aforementioned method, then treat the metal sheet with a rust encapsulator.

Move to the next step only when you’ve thoroughly cleaned your car and made it free from dust, rust, and specks of dirt.

Get Handy Tools and Safety Materials to Expedite the Process

You need to be well equipped with the equipment for a better result.

Don’t worry, I’ll not ask you to arrange any expensive or sophisticated tool.

All you need to do is get a face mask, a pair of gloves, and a hat for yourself before you start the process of spray.

After all, it’s an old saying, “Prevention is better than cure”.

A face mask will protect your face and eyes from the spray.

Moreover, gloves will keep your hands clean.

Note: The probability is quite high that dealing with spray would make your clothes dirty

So, wear clothes that you don’t mind getting stained.

Spray guns and mixers are additional devices that you may need, so it’s good to have them handy.

On the other hand, soundproof spray such as Lizard Skin Sound Control comes with a kit that includes all the necessary tools such as a spray nozzle, canister, mixing drill tip, and a wet mil gauge that you may need to expedite the process.

So, once you’ve all the things in place, open the liquid spray and mix it over a piece of cardboard before putting it into a spray gun.

Needless to say, mixing is very important as it makes the solution homogeneous.

Applying the Car Soundproofing Spray

Before applying the car soundproofing spray, I’m assuming that you’ve gathered the required tools, taken safety precautions, and cleaned the metal sheets as well as other critical areas thoroughly.

So, now it’s time to implement a spray-on deadener.

Make sure to spray it at least 10 inches away from you and it is highly recommended that you use a mask and a pair of gloves to avoid direct contact with the soundproofing spray with your face and hand.

It will take at least 20-25 minutes for the first layer to dry.

I highly recommend using multiple layers to get an optimum result.

So, once the first layer is ready, you can go for the second layer.

Again, the second layer will also take 20-25 minutes.

Continue the process for each and every layer.

Most of the time, I’ve been asked a question How many layers of the spray should I use for the optimum result?

Well, the simple calculation is the more layers the better will be the result.

However, I highly recommend my clientele, use at least 3 layers of car soundproofing sprays if they are willing to see satisfactory results.

In case, you want the result something similar to expensive products such as foams, mats, and insulations, then definitely you should go for more layers.

Remember, the thickness of the sound-deadening spray plays a crucial role in deciding its combating capabilities against different sorts of external noises.

Most first-time buyers or newbies make the mistake of not providing the first layer with adequate thickness, and they later end up blaming and criticizing the product.

So, if you want the sound-deadening spray for your car to perform to its best capabilities then you need to make the first layer at least 25 mils thick.

Use a wet mil gauge to measure the thickness.

Each layer following the first layer should be 20 mils thick.

Once you’re done with the spraying, give the layers at least 7 hours to get fully dried and then you can paint over and fully polish.

It is not compulsory to polish and paint but I recommend you to do so for a better outcome.

Re-assemble Everything

So, once you’re done with the last three steps, all you need to do is, put everything back into the car that you removed from it for the spraying purpose.

But, before reassembling the car parts, it’s good to cross-check the thickness of each layer and whether each layer has dried to a satisfactory level or NOT.

Depending upon your past experience as well as expertise, this process can be time-consuming or a quick one.

I’m assuming that you’ve placed everything back in place, so all you need to do is double-check whether they are in the correct place or NOT.


Well, in this section, I’ll be answering quite a few questions asked by either my clientele or the readers of this blog.

In case, you’ve any queries or doubts related to sound-deadening sprays for cars then feel free to ask us in the comment section.

What are the best sound-deadening materials for cars?

I would answer this question in terms of short-term as well as long-term solutions.

It goes without saying that if you’re looking for a short-term solution to external noise then definitely nothing could suffice to sound deadening sprays for cars.

On the other hand, if you’re looking for a long-term solution then I highly recommend sound-deadening mats such as Dynamat, Noico, FatMat, HushMat, etc.

Needless to say, Dynamat is the market leader and the premium price that it charges is easily sufficed by the quality that it provides to you.

If you’re on a shoestring budget then you can try NOICO.

Hope it helps.

Does a sound-deadening car improve the audio quality?

There is no reason why sound-deadening materials such as mats, sprays, insulations will not work.

Each one of them has its own Pros and Cons, and before you select any automotive sound-deadening material you need to evaluate the product on the performance parameters at least if not others.

For example, say you want to improve the audio quality of your car.

I’m assuming that most of you’re car owners.

As we all know in most cars the speakers are mounted in the front doors as well as behind the rear seats and facing towards the rear windows.

There is a big problem with the positioning of the speakers as the vibration of these speakers could shake the whole or a portion of the car in such a way that the ambiance becomes noisy and the quality of sound degrades drastically.

Sound deadening materials such as Dynamat, a cut-to-fit sheet, are highly capable of absorbing the vibrations and thus, help in securing high-quality audio sound.

However, the end result to a great extent depends upon how well the Dynamat is installed.

It’s A Wrap

I hope you would have thoroughly enjoyed every piece of information that we shared by means of this post.

Sound-deadening sprays for cars are definitely a short-term solution and come with their own Pros and Cons.

Sound Deadening your car with the help of sprays can help you get rid of unwanted noise in a couple of minutes.

Unlike Dynamat, you don’t have to worry about cutting or installing the sound-deadening spray.

All you need to do is, clean the crucial parts where you want to spray and make sure that the dust, dirt, and rust are properly removed, and then spray those parts properly.

Don’t forget to wear a face mask and a pair of gloves to prevent any debacle.

So, which is the best sound-deadening spray for your car?

Secondly, what is the budget that you’re willing to spend on sound-deadening your car?

Lastly, share this piece of information with the ones who are in need of it.

After all, sharing is caring.

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