2020’s Best Car Undercoating Sprays (Top 10 Guide)

Using the best car undercoating spray can help eliminate a variety of common issues associated with road debris. The undercarriage of the car is the most vulnerable area because it gets exposed to all the elements plus rocks, dirt, salt, and much more.

Learning and educating yourself on these sprays can be the difference between components of your car rusting out or outlasting your expectations. In this guide, we’re breaking down the top 10 best car undercoating sprays of 2020!

How Did We Pick the Best Car Undercoating Sprays?

Undercoating spray might not be an expensive purchase, but you don’t want to go online and buy anything and start spraying it all over your car if you’re not sure that it’s the best choice. There are some unique ingredients and elements that go into making these sprays. Since no two products are the same, we want to make sure you choose the right one.

When you’re scouring the internet for the best car undercoating spray, here are some buying factors you should keep in mind:

Method of application – Undercoating spray comes in a few different methods of application. Most people would consider aerosol spray to be the easiest way to apply, but they’re not always the best option. Some undercoating comes in a gallon can, and you need to brush it on. You might get more for your money here, but it’ll be easier to miss spots.

Ease of application – The process of applying undercoating spray is not the simplest automotive task you’ve ever done, so you need to follow the instructions carefully. That said, some are much easier to apply than others, so make sure you understand the different materials and how they impact how easy they are to apply.

Thickness – The thickness of the undercoating is important because you don’t want it to be too thick, which will make it difficult to perform repairs, and it could damage components of your car. If it’s too thin, it won’t protect your car from the things you’re applying the undercoat for in the first place. Look for something somewhere in the middle range so you can get the right coating.

Consistency – Another important factor to look out for is the consistency of the undercoating. You need something that dries hard enough to protect the car, so it shouldn’t be too pliable, but again, it needs to be somewhere in the middle because someone working on your car will need to work around it to get at the parts under your car.

Keeping all of these important points in mind will help you to decide from the following top choices for undercoating sprays.

Rust-Oleum 248656 Professional Grade Rubberized Undercoating

The top pick is a pro-grade undercoating spray popular for use on bare or primed metal underbodies. You can use this on cars, trucks, RVs, trailers, and anything with moving wheels.

The professional-grade formula offers protection from corrosion caused by water, salt, and chemicals used on the road. It comes in an aerosol can, which makes it easy to spray and the undercoating dries to the touch within one hour. You can cover as much as 15 square feet per can, and the comfort spray tip makes it easy to spray at any angle, even upside down.

Price Range: Low

3M 03584 Professional Grade Rubberized Undercoating

The next rubberized undercoating on the list is great for use on cars, trucks, and all recreational vehicles. It’s a black protective undercoating that helps keep the undercarriage of your vehicle safe from road debris, dust, dirt, rocks, and much more.

It comes in an aerosol can that makes it easy to spray, and it has a no-run formula that offers a clean and professional application. In addition to protecting the body of your car, it also has sound-deadening features that reduce road noise and provide a more comfortable and quiet riding experience.

I recommend that you purchase approximately seven of these cans to coat the entire underside of most vehicles.

Price Range: Medium

Rusfre Automotive Spray-On Rubberized Undercoating

If you’re looking for something with a bit more value, you’ll want to check out this car undercoating material. Instead of using an aerosol spray can you’ll want to get a paint sprayer or something similar to apply this one. You can apply it very quickly, and the whole gallon should handle most standard vehicles.

The product does not get as hard as some other undercoatings, which is actually an advantage because it is workable, and it won’t crack over extended periods. It’s a bit thinner than some people would like, but overall it gets the job done and offers a great value.

Price Range: Low

Cosmoline RP-342 Heavy Rust Preventative Spray

Cosmoline is a high-quality, military-grade rust inhibitor that works great as an undercoating to prevent rust and corrosion. While this might not be an undercoating spray, it works similarly. One coat will protect any metal surface for years, no matter how much abuse you put it through.

The purchase comes with six aerosol cans, which is enough to handle most jobs. The aerosol cans make it easy to get under your car and spray, but be sure that you have enough ventilation because the fumes are strong. You spray it onto a dry surface, and it will dry completely in around 25 minutes. It does not wash off or wear away over time.

Price Range: Medium

Fluid Film 1 Gallon Can Rust Inhibitor

The next choice is a heavy-duty rust inhibitor that goes on strong and stays on for years to come. It’s solvent-free, so it doesn’t dry out over time, and it’s lanolin-based, so it’s not harmful to the environment.

It comes in a gallon container, so you will need to spray it on using a gun, but the manufacturer suggests that you purchase a Fluid Film specific spray gun because the consistency of the undercoating is very thick, so it makes it hard to get on.

That said, once you do get it on properly, it lasts long and protects the car no matter what conditions you are in. I recommend if you live in a place that experiences harsh winters, and the roads have a lot of salt on them.

Price Range: Low

Evercoat 1348 Low VOC Premium Rubberized Undercoating

Evercoat is a premium rubberized undercoating that you can use on bare metal or painted surfaces. It creates a barrier between the metal and all the things you kick up while driving on the road. The coating is also non-asphaltic, so you can use it on panels, splash pans, and wheel wells, and it won’t cause any damage.

You’ll use the simple aerosol spray can to spray it on, but you’ll want to purchase at least six or seven of them to do your entire vehicle. Wait five minutes in between coats, and it will take around two full hours to dry. The standard color is black, and you can paint over it.

Price Range: Low

3M Dynatron Dyna-Pro Paintable Rubberized Undercoating

If you feel like you need something a bit stronger, you’ll want to give this undercoating spray a look. It’s a flexible rubberized coating that creates an unbreakable barrier between the body of your car and the road. It’s fully paintable and texturized to help match paint finishes, so you get a better appearance.

This professional-grade undercoating spray is intended for body shops, but you can purchase it for your home for the highest-quality job. To do this job the right way, you’ll want to get an undercoating gun and spray it on. The consistency isn’t too thick, and it goes on nice and easy, but it’s recommended that you scuff the paint to give the spray a rough surface to grab on to.

Price Range: High

Tite-Seal by Gunk Paintable Auto Body Undercoating

The next choice is a paintable underbody aerosol spray that goes on easy. It comes with a case of 12, so one purchase should be enough to do your entire car and then some. The spray is designed to create a barrier between the road and your car to protect the metal from corrosion due to moisture, dirt, and salt.

Tite-Seal goes on easy and offers a flexible but tough coating. One can covers approximately five feet of surface area, and the spray can itself is highly functional because it sprays on evenly, and you can spray in any direction.

Price Range: Medium

POR-15 49308 Black Paintable Undercoating

This undercoating aerosol spray works well at protecting the components of your vehicle while also acting as a sound barrier to limit road noise. The can is 22 fluid ounces, so you will need to purchase a few of them to complete the job. It’s recommended that you prepare surfaces before spraying them with this.

There were some issues with cans getting clogged and stopping and make sure that you have plenty of ventilation because the fumes are potent. Overall, this underbody spray goes on smooth, and it does a great job of hiding imperfections as well.

Price Range: Medium

Eastwood Internal Chassis Frame Coating

Our last pick is another aerosol spray can that comes with a long tube and conical nozzle to help reach into tough places. This spray is specifically designed to cover and eliminate rust that develops inside the chassis, and the phenolic resin penetrates and captures the rust, so it doesn’t escalate into a further problem. It cures within 24 hours and goes on easy.

One aerosol can covers up to 10 square feet, and the extension tube helps spray in a radial pattern so you get a beautiful even coat and you don’t waste any of the spray. One issue that some people have with this one is that it’s very thin and runny, so it works it’s way through holes and cracks.

Price Range: High

Why Undercoat Your Vehicle?

Many people might think it’s not necessary to undercoat a car because that’s something the manufacturer does, why should you have to do it? I’m not saying to go out there and buy undercoating spray for your model year Toyota Camry, but if you’re driving an older vehicle or refurbishing one, you’ll want to spray it.

If the car hasn’t hit the road in a while and you’re putting it back out there, you’re exposing it to unfamiliar elements like dirt, debris, and road salt so it will rust much faster and having an undercoating on it will prevent that.

Another situation that would merit an undercoating would be if you buy a car from certain locations in the country that experience harsh elements that you’re not used to. Let’s say you live in Arizona or Texas, and you buy a car from somewhere in New England. That vehicle has seen some things you could never imagine, and the body has likely paid the price.

If you’re unsure about whether or not you should go through with using an undercoating, contact your local mechanic and see what they have to say. They’ll point you in the right direction, and they might even be able to recommend a product.

Methods of Protecting Your Vehicle

There are many ways to rust-proof your car, and some are less common than others. There are some newer methods out there, and in this section, let’s break down all the ways you can do it.


Believe it or not, you can electronically protect your car from rusting. With the newest vehicle I purchased, they offered this feature. I didn’t take it because it was pricey, but it was still interesting. They attach an electronic module to your engine that sends a negative current through the body, which stops corrosion.

I think the technology is a bit new to know if it actually works, and I’m not sure how you find out if it worked anyway. It’s not said to eliminate or prevent rust for good, but it slows down the progression of it.

Rubberized Spray

The rubber tar-like sprays are what we’ve spoken about most in this article. These typically come in an aerosol can or a gallon container, and you need to spray them onto the underbody of the car using even sweeps. When you do this, it creates a wall in between the road and the metal to protect it.

These sprays are highly toxic and flammable when they first go on, so you need to make sure you have plenty of ventilation and stay away from all heat sources until it dries. It’s safe to spray on all metal components of your car, and some you can even spray in wheel wells and on plastic.

Oil Spray

These are a wax-like substance that you spray onto the metal, but it’s more liquidy than the tar sprays. Oil sprays are great for reaching tough spaces, but they run a lot more, so if you have a lot of holes and cracks, it will be easy for this spray to fall through the holes instead of building the barrier on top.

It’s Your Choice

If you’ve decided that using an undercoating spray on your vehicle is something you’re interested in, I suggest checking out one of the ten options available above. These are all high-quality products, but they each have some similarities and differences. You might find that what works for someone else won’t work for you.

Regardless of what you choose, protecting your car’s body is an important part of extending its life, and making sure that you have a safe and reliable way of getting from point A to point B.

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