best rust prevention spray for cars

Best Rust Prevention Spray for Cars – Don’t Let The Rust Bug Bite Your Car

Affiliate Disclosure: Some of the links in this post are affiliate links. As an Amazon Associate, we earn from qualifying purchases. Read more in our affiliate policy.

Our automobiles are one of our most precious possessions. It goes through a lot every day, it battles all sorts of elements just to get us to our destination. Chances are, you care for your vehicle deeply and you would only want the best for it as well.

That’s why you’re here, you’re looking to protect it from one of the nastiest things that could plague it, RUST. Fret not, we got you covered here at, here are our picks for the best rust prevention spray for cars.

Let’s get the ball rolling!

In a Hurry? Here’s Our Best Pick:

Our highlighted and best anti rust spray for cars is no other than the Rust-Oleum 248656 (Black). It is a professional-grade, corrosion-resistant, rubberized undercoating. It comes in 15 oz. cans, aerosolized mist. It is paintable, quick-dry and deadens sound. We’ll discuss this and more other trusted brands in our next section.

Best Rust Prevention Spray for Cars – Reviews

Rust-Oleum 248656 Professional Grade Rubberized...

Rust-Oleum 248656 (Black) – Best Car Rust Prevention Spray

The Rust-Oleum 248656 (Black) is part of the brand’s professional series. It is an automotive rubberized undercoating, an aerosolized mist that comes in 15 oz. cans.

It has a solvent like odor or scent, applicable to metal, and is corrosion-resistant.

It provides great protection from water, salt, and other chemicals, it helps deaden sound and the rust preventive formula helps provide a barrier from a variety of vehicle types like your car, truck, trailer, and other recreational vehicles.

It is quick to dry and paintable.

What do people say about it?

People say that this product works as well as advertised, it holds out long and its quick-dry feature is impressive.

It applies thickly and sticks rather nicely, no dripping and its undercoating capacity is just as impressive.

Make sure to clean or remove any existing rust properly though before applying or else it will flake over a few months, otherwise, it should last you for a long time.

A little bit of downside about the product is that it doesn’t spray much per can, so if you’re unsure about how much you’d need, make sure to order more to make it worth your while.

Other than that this product is getting very good reviews at Amazon.

BOESHIELD T-9 Rust & Corrosion...

BOESHIELD T-9 Rust Protection Spray for Cars

The Boeshield T-9 is a Rust and Corrosion Protection and Inhibitor and waterproof lubrication. It comes in 12 oz. cans and is used in marine, bicycles, automotive, tools, recreational vehicles, and aviation.

It loosens rusty, corroded parts and is safe on paints, any metal surfaces, plastics or vinyl. It flushes out dirt and old lubricants, it displaces moisture and penetrates moving parts.

It dries to a thin and waxy film that clings to metal for months. Also developed by the brand for lubrication and protection of aircraft components.

What do people say about it?

Very versatile spray, whether it’s a dusty ATV or a shower door it works perfectly fine. Works on a variety of vehicles too.

Works perfectly on bike chains that have been soaked with rain and mud. One of the best lubricants and metal protectors out in the market.

There were some complaints about how the can stop spraying way too early, but the company has suggested a workaround to soak the cans in hot water for about an hour and that should do the trick.

Get it at Amazon here ->

WD-40 Specialist Corrosion Inhibitor, Long-Lasting...

WD-40 Anti Corrosion Spray for Cars

The WD-40 is dubbed as the specialist, boasts long term corrosion protection. It comes in 6.5 oz. cans and it coats metal parts to lubricate and protect against rust.

It blocks rust and corrosion for about 2 years when used indoors and 1 year when used outdoors as the formula clings to metal to protect it from air and moisture.

Highly recommended for preventative maintenance and for corrosive environments, such as humid, cold, wintery or even hot atmospheres.

Precision controlled application made possible by the included straw, that’s securely stored by the notched cap.

What do people say about it?

Perfect anti-rust spray for cars especially if you park outdoors, most especially for super cold, humid or hot climate.

It’s also very versatile as it can also be used in everyday things like your saw blades, tools or even your 12V switches. It’s perfect for everything in your open garage and it lasts for a really long time.

Goes for a very sticky application though and make sure to leave no untreated parts in your car as it might accumulate rust and affect the treated area after some time.

Otherwise a very versatile and one of those products online with good reviews.

3M Professional Grade Rubberized Undercoating,...

3M Professional Grade Rubberized Undercoating

3M Professional Grade Rubberized Undercoating provides one of the best anti-corrosion, sound deadening and insulation protection. It comes in black and 16 oz. cans, an aerosol, and water and salt resistant spray.

It produces a very nice textured finish that resists, abrasion, chipping, weathering, and exterior rusting. No dripping, running or sagging either.

It’s excellent and highly recommended for automotive undercarriages and for protection for wheel wells, fenders, quarter panels, etc.

What do people say about it?

Very easy to apply especially for undercoating your car. One of the rather effective anti-corrosion spray for cars.

Will stick to virtually anything, spray on your grill or taillight guards or anywhere you desire on your vehicle, it doesn’t matter, it works perfectly.

There was some feedback about it no longer spraying when halfway through the can and also that you need to spray it on a certain angle or the spray will fade out and you’ll be left with no aerosol.

It’s also a bit pricey to some other sprays out there but based on reviews and pretty good ones, it’s totally worth it.

STA-BIL Rust Stopper - Anti-Corrosion Spray and...

Sta-bil (22003) Car Rust Protection Spray

The Sta-bil 22003 is a heavy-duty rust and corrosion inhibitor aerosol spray. It’s also a long term rust blocker, protectant and lubricant for metal that comes in 13 oz. cans.

It’s also one of the best rust protection sprays for cars out in the market.

Sta-bil 22003 boasts long-lasting barrier protection on metal surfaces. It has a wide application not just for your car but also for boats, chainsaw, trucks, chains, snowplows, and works on electrical equipment and painted surfaces too.

What do people say about it?

Super effective on rust on metal surfaces, it would even look like it melts the rust right off. Dissolves rust rather quickly and stays on for a long while.

Works as advertised and is definitely one of the best out there. It also lubricates as an added benefit and is great for indoor use as it smells rather nice.

Not ideal for those who don’t want a thick, sticky, oily spray. Not that quick a dry but very effective against corrosion. It needs a little bit of a reapplication though for more added protection.

Check price at Amazon ->

Rust-Oleum 248658 Rust Reformer Spray, 10.25 oz,...

Rust-Oleum Automotive 248658

The Rust-Oleum Automotive 248658 Rust reformer spray comes in a 10.25 oz. can.

It instantly bonds with the rust on your car and transforms it into a non-rusting, flat-back paintable surface and will prevent from future rust from developing. No need to sand all the way down to the bare metal.

With any angle spray with a comfortable tip.

What do people say about it?

Very reliable vehicle rustproofing spray protects your automobiles for a very long time. It converts rust very well and is one of the rather trusted rust sprays out there for a long time now.

Yields a very nice flat finish even better than your usual primer. It’ll restore rusty automotive parts wonderfully.

Just make sure to apply it pretty thick for maximum efficiency and a nice finish.

Get it at Amazon here

MSNOR Cosmoline RP-342 Heavy Rust Preventative...

Cosmoline RP-342

The Cosmoline Rp-342 is a military grade “heavy” preventative spray. Strong, thick, long lasting and fast drying rust preventive aerosol spray.

Protects all materials, metals, iron, and steel whether stored indoors or outdoors and lasts for years. Produces dry to touch, see-through (amber translucent) wax coating.

The application withstands severe outdoor conditions, salt-laden atmospheres, acid, and caustic fumes and other severe damaging environments.

A 100% assurance that it will not crack, craze, peel or flake and will remain flexible over time.

What do people say about it?

Sticks really well spray-on thin, and it is very easy to use and apply. Tough rust protection for all types of vehicles, and will protect your car for a long time.

It is used for guns and antique weapons and that goes to show how effective this spray can be. It works on all weather conditions.

There are some instances where even after drying it can be scratched away very easily so you may need to reapply when this happens.

But this is one tough protection spray for all your needs, very versatile and highly rated.

Rust Kutter - Stops Rust and Converts Rust Spots...

Rust Kutter – Rust Converter, Protection Spray

Dubbed as the professional rust repairer, Rust Kutter is a Rust converter and rust protection spray. The Rust Kutter gets rid of rust and primes metal to prevent it from forming again.

It comes with a sprayer and is ready to use. Protects not just from rust but also from corrosion. Effective for essentially anything that gets rusty, interior and exterior.

What do people say about it?

Very effective on iron, steel, and metal, and is perfect for your cars. It has a specially formulated mixture that restores even the most heavily rusted parts of your vehicle.

Just make sure to prepare the surface you are applying it to very well, shake well and let it stay overnight for it to do wonders on your automobile.

In some instances, you need to apply the primer right away as rust seems to go back, but these are very rare comments by users of the brand.

General comments also say to be equipped with all your safety paraphernalia when applying it like your safety goggles and gloves just to be on the safe side. Overall it’s got great reviews from users online.

Permatex 81849 Rust Treatment, 10.25 oz. net...

Permatex 81849 Rust treatment, Aerosol 10.25 oz. Can

The Permatext 81849 Rust treatment is a leading rust protection spray that is applicable to all automotive needs. It is easy to apply and within minutes, say goodbye to the rust that’s been plaguing your vehicle.

The tough coating serves as an excellent protective primer that is paintable. Formulated to work on body filler and fiberglass.

What do people say about it?

People say that this rust spray works perfectly on any parts of your vehicle, whether on drive shafts or exhaust hangers or just about anywhere.

It also helps with the fine finish (has a nice touch to the color) in your car especially when you paint over it. It also works on outdoor furniture, lights and just leaves it for 24 hours before repainting.

There have also been numerous complaints online though that this doesn’t really work as advertised, that it’s not paintable and doesn’t work really well on rust.

But the positives still outweigh the negatives based on our research, and good reviews are still pouring.

Buy it at Amazon here

Car Protection Against Rust – Guide

What to consider when buying best rust protection spray for cars?

vehicle rust proofing sprayThere’s a lot to consider when shopping around for a proven rust prevention spray for your car.

Here we list some of the things that are worth considering to get your money’s worth and to efficiently protect your car and get rid of rust.

  • Consider the surface

    Needless to say, knowing your surface beforehand saves you a lot of time, money and energy.

    Whether it’s going to be for metal, iron, or which most sprays available are meant for all of these at once. Or whether this is for other types of materials like fiberglass. There are rust prevention sprays out there that are specially formulated. So be sure to check on it before buying it.

  • Consider if it’s for removal or prevention

    There are sprays that dissolve rust, there are that prevents rust from further developing, there are also products that you need to remove the rust first before applying so that it’ll treat the surface for a long time.

    Consider these options whether you want to sand down the rust before application or you just want to apply it right away. It’s up to you, different products work differently, they all have their own strengths and weaknesses. Do what’s best for your vehicle.

  • Did you want to paint it or not?

    A lot of the sprays available are paintable, some even help give the surface a fine finish after application. So consider if you want to repaint it after or not, there are sprays that even serves as a good primer and that there’s probably no need to apply anything after (although not really advisable).

    A lot of the rust prevention sprays out in the market are do it all formulas, so consider what’s best suited for your needs.

  • Consider the application

    Want to use a brush? Or prefer spraying instead? It’s up to you. Some sprays are easier to apply than another, some are sticky, oily and thicker than the rest.

    Consider these things to prevent frustration with the product especially if you bought the wrong one for your rust prevention needs or the vehicle you’ll apply it too. Especially if it’s for hard to reach areas.

Why Worry About Rust? What is rust?

stop rust corrosionRust is the corrosion of iron and its alloy steel. It usually occurs when steel is unprotected when iron, oxygen, water (air moisture) combines.

Rust is very damaging to almost anything made in iron, but the good news is that it is preventable.

That’s why these rust prevention sprays are essential, especially for a valuable possession like your car.

Rust compromises how your car’s different components work and overtime might deal with some serious costly damages.

Preventing rust will most definitely lengthen the lifespan of your vehicle. Who knows you might resell it in time or maybe turn it over to your son or loved one.

Stop Rust Spray vs Paint

When to choose whether to buy the spray or paint for rust prevention?



  • More durable thicker application
  • Easier to apply on areas with thicker coating, on any product


  • Significantly longer to dry
  • More time consuming for application
  • Challenging coverage for larger areas



  • Easier application, especially in hard to reach areas of your car or any vehicle desired
  • Very quick application and can cover large areas rather quickly


  • A much thinner layer of protection might need reapplication
  • Problematic spots may be more challenging to cover

anti corrosion spray for carsIn conclusion, rather than choosing one over the other it is better to employ both techniques for maximum efficiency and for best results.

A spray can cover the weaknesses of paint and vice versa, and it’s going to be your money’s worth in the long run.

Maintenance against Rust

We’ve been talking about prevention or treatment of rust through all of these amazing sprays but we actually need to discuss the different ways of maintenance that you can do to actually prevent rust from developing in the first place.

Sound challenging? Maybe, but it’s worth the extra effort.

It’s important to wash your car’s underside at the start of spring or autumn to prepare it for any rustproofing.

These times of the year are important to take note of since it’s a means of preparing from the upcoming harsh weather conditions like winter or the hot summer.

Make sure to rustproof your car’s undercarriage, all nooks, and crannies to be thorough as sometimes if there are some untreated areas rust can still develop.

Lastly, make sure to wash your car often during winter and avoid puddles if possible.

Rust Proofing Car – FAQ’s


Should I really worry about rust?


Most definitely, it’s been proven for ages to deal huge damages on anything iron and other materials it can develop into. Sometimes, irreversible damages.


What is rust proofing?


Rustproofing is the prevention or delay of rust development on any iron or steel objects. The protection is achieved by surface finishing or treatment.


What is rustproofing for cars then?


Rustproofing for cars is when your car’s underside is coated with a material that prevents rusting.


How much does rustproofing cost?


Around $500 – $1000 from dealers. That’s why sometimes people hesitate, as they would think that it would not be worth it.


Is rustproofing a must or a myth?


Tricky answer to a tricky question. Rustproofing is a must, but there may be some instances where you may not need it at first.

Let us explain.

As mentioned above people might not avail of rustproofing at first because of the price of the service. Sometimes it makes sense because there are car manufacturers nowadays, especially in the US that uses materials like galvanized steel coated in zinc that makes the underside of your car already rustproof.

This is also applicable to aluminum of fiberglass. But the reality is in time, you would definitely need rustproofing and that’s where the need for rust prevention spray arises.


How often do I need rustproofing?


Once a year should be ideal.


How long does the rustproofing service take?


About only an hour, for a worry-free year.


Does rustproofing wash off easily?


Of course not, it doesn’t get washed off by simple water or soap. Car washing won’t affect it at all.


What are the best brands for rust prevention sprays out there?


WD-40, Permatex, 3D


What are the different types of rust prevention sprays?


Inhibitors/Prevention – This type of rust prevention spray prevents rust from developing or delays the development of it.

Removers – Some of the best brands qualify in this category. These are rock star brands that you can spray directly to the affected surface and will dissolve rust in no time.

Primers – These are formulas that you can repaint on. Some sprays are all in one product. They work well to make paint stick on top of it after application.

Where to Buy a Vehicle Rust Proofing Spray?

You can purchase your trusted rust prevention spray on any hardware or automotive shop.

But it’s best to purchase online as well for great deals, tons of choices, available reviews for trusted products, and easy return processes.

If that’s not enough, online, you’ll have the bonus of getting shipping discounts if not getting it for free.

Amazon is a good site to start for your online shopping needs.

Best Rust Prevention Spray for Cars – The Bottom Line

As they say, prevention is always key, but if the damage has already been done, there are still tons of ways to remedy car problems.

The best rust prevention sprays for cars out in the market, like the Rust-Oleum 248656 (Black), are specially designed to prevent, get rid and protect your car’s health and for a long while.

After all, our car’s lifespan would depend on how much we take care of it. We definitely only want what’s best.

Last update on 2024-06-16 / Affiliate links / Images from Amazon Product Advertising API


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