The 16 Best Rust Inhibitor Paint and Spray for Car and Trucks

When it comes to auto maintenance, most people usually stop at car washing and detailing. But that’s not very thorough. If there are products like rust inhibitor for cars, then that means that there are other steps you might need to do for better car care.

Rust formation is one of the car problems you will encounter early on as a car owner. That is why auto rustproofing and undercoating is a needed service you will have to avail.

If you are definitely against rust formation, an anti corrosion inhibitor (a.k.a corrosion inhibitor) and rust inhibitors are an excellent way to get a protective barrier around parts of your ride. It’s time to take rust prevention seriously!


Discover the Best Rust Inhibitor for Cars

Rust is something that forms very easily, no matter what you do. Just a mixture of iron, oxygen, and water will make rust so the next best thing is to use tools to keep your vehicle super safe and well-protected from car rust.

You can use rust converters and corrosion inhibitors as examples. Brands like Rust Check can give you really good performance. These products are widely available. You can even buy some of them online at Amazon. Or, visit Rust Check at their Westbrook, ME service center if you are looking for a rustproofing your vehicle.

Especially for vehicle in the cold countries, your ride will be exposed to elements of the environment like salt that used to melt the snow and whatnot, rust and corrosion are indeed inevitable.

Good thing Benzo Triazole and Zinc Dithiophosphates are some of the corrosion inhibitor chemicals that would help your ride last longer for years to come.

So, in this article, we’ll explore:


Best Rust Inhibitor Paint for Cars

rust spray paint

Now that you get that rust is a very real problem you would have to deal with, you would need to do proofing to keep the surface of your car safe from corrosion. A product you can look into is rust proof paint for your car or some type of rust prevention oil.

So, what is the best rust prevention product?

Here are some of the best rust inhibitor for cars you can check out:

1. Rust Inhibitor POR 15 Rust Preventive Permanent Coating

POR-15 Rust Preventive Coating, Stop Rust and Corrosion Permanently, Anti-rust, Non-porous...
9,641 Reviews
POR-15 Rust Preventive Coating, Stop Rust and Corrosion Permanently, Anti-rust, Non-porous...
  • ✅ CURED BY MOISTURE – The secret strength...
  • ✅ APPLICATION - Remove grease, oil, and...
  • ✅ WHEN DO I NEED THIS – Automotive, Farm,...

Now, sometimes rust formulates in certain parts of your car even before you can do some rust proofing. Yes, it’s irritating but it’s not the end of the world!

You can still rust proof the metal even if it’s already rusted. All you need to use is the permanent coating made by POR-15.

You can just seal in the rust and still shield your ride from further damage. It acts like some kind of rust-proof paint since it can still provide a little bit of the shine you want with the added benefit of repairing and preventing rust from further forming.

If you want something that can hit two birds with one stone, then this is a good match for you.


2. Rust Bullet Automotive Rust Inhibitor

RUST BULLET Automotive Quart - Rust Inhibitor Paint and Rust Preventive Protective Coating - No...
  • PATENTED - Awarded two United States Patents
  • LOW PREP - Little to no prep required! One...
  • DURABLE - UV resistant - no topcoat needed -...
  • EASY APPLICATION - Apply with brush, roller,...

If you’re looking for quality rust proofing products, this one from Rust Bullet fits the bill perfectly. Its coat protects your vehicle’s paint as well as prevents rust from forming.

Like many other rust inhibitor products, you can also use this even when there’s already rust. By permanently sealing in the existing rust, you can stop it from worsening.

This heavy duty and high performing product can also be used in other equipment, be it industrial, marine, or in the home.

Also, check out the product comparisons between Rust Bullet and other brands in the market. You will be amazed by the result.


3. Hinderrust S4.0 The Rust Stopper

Hinderrust S4.0 'The Rust Stopper' Quart Container
23 Reviews
Hinderrust S4.0 "The Rust Stopper" Quart Container
  • Expands to cover exposed parts of metal not...
  • Bonds to metal at the atomic level
  • Extremely resistant to being bumped or wiped...
  • Extremely long-lasting and effective at...

If you’re looking for a rust-inhibiting lubricant that is both solvent-free, odor-free, and non-aerosol, then the S4.0 by Hinderrust is the one for you.

Additionally, this product doesn’t just prevent further rust from forming. It can also make frozen or stuck car parts move again hence the lubricant part.

It’s amazing against saltwater corrosion and you can use it for a whole number of things, not just on your car. Apply it on industrial machines, marine transportation, shop tools, and many more.

You can even use it on everyday household stuff like gardening tools, nuts and bolts, and even locks and hinges.


4. Fluid Film Rust & Corrosion Protection

Fluid Film 1 Gallon Can Rust Inhibitor Rust Prevention Anti Corrosion Anti Rust Coating Undercoating...
  • Rust Preventive Lubricant
  • Solvent Free, will not dry out. Long Lasting
  • Environmentally friendly. Lanolin based....
  • Anti freezing agent. Geat for snow blower...

If you want a rust inhibitor that guarantees maximum protection, then this Fluid Film rust inhibitor paint is one of your best choices.

This rust preventive lubricant has lots of purposes you could use it for so you know you’ll be getting a really great deal. Plus, you don’t need to feel guilty about making use of this product because it’s environment-friendly!

Its Thixotropic formulation is created with wool-wax, refined petroleum oils, and other special agents. The Thixotropic formulation aid in controlling the rate of corrosion happening to your auto.

Corrosion can be slowed down by penetrating the metal base of hard to reach areas of your undercarriage. With this, your ride will be protected all over!

It’s also solvent-free so you know it won’t dry out fast. Its non-toxic and non-hazardous properties making it safe to use.

Fluid Film is an excellent product can be used in a lot of other equipment as well. Use it on your truck or lawn mower. You can even use it on your snow blower chutes because of its anti-freezing agent.

Also, it comes in different sizes from a small 11.05-ounce bottle to a 5-gallon bucket.


5. Rust Converter ULTRA

FDC Rust Converter Ultra, Highly Effective Professional Grade Rust Repair (1 Gallon)
  • CONVERT RUST: Convert rust to an inert...
  • SAFE TIME & MONEY: Eliminates the need for...
  • EFFICIENT: 1 Gallon Covers 500 square of...
  • ULTIMATE PROTECTION: Convert toughest rust...

Another excellent rust inhibitor product you need to try is this rust converter from FDC. It doubles as a surface conditioner and primer that transforms rust into a protective coating made out of polymer.

This product actually needs that rust to work. By converting iron oxide into a polymeric barrier, this product helps eliminate existing rust, prevent further rust formation, and keeps your car very well protected.

Not only that but it seals out moisture and is an excellent primer for oil-based paints. Plus, you don’t need to do any surface preparation. So say goodbye to sandblasting, grinding, and scraping!

This product is also fast with its first coat drying in 20 minutes. But if you want the best results, remember to add another coat on top of it. Let it cure for about 48 hours and seal it with a high-quality oil-based paint.

Once you buy it from the store, it’s ready to use. No need for thinning, just shake or stir. You can even apply it with either a brush, a roll, or a spray.


6. Rust-Oleum Automotive 8-Ounce Rust Reformer

Rust-Oleum 248659 Rust Reformer Brush On, 8 oz, Black
  • Use on any rusty, metal surface to Instantly...
  • Oil based formula creates a bond with rusted...
  • Dries tack free in 15-20 minutes, allow 3...
  • Unique formula transforms rusted surfaces...

Another excellent rust inhibitor for rust proofing your vehicles is this Rust-Oleum’s rust reformer.

What’s great about this rust inhibitor paint is that the solution instantly converts the rusted surface to an inert surface and ready to be painted over for a smooth and durable finish that resists the formation of further rust in the future.

Many buyers love this product and agree that Rust-Oleum’s formula is an effective product to tackle rust for vehicles.


7. Black Star Rust Converter

MRO Chem Black Star Rust Converter - Converts Rust on Any Steel Surface - 1 Gallon
  • Black Star Rust Converter – No more...
  • Won’t Re-Rust – After converting your...
  • Unlimited uses – If it rusts, Black Star...
  • Paint primer – Rust is difficult to paint...

Another rust inhibitor paint that we found which perform well is from MRO Chem Black Star. If you want a rust converter that will give you only the best performing power, this is the product you need to try!

It can instantly turn rust into a hard polymer resin coating that is super smooth and corrosion resistant. if apply it correctly, it will seal of rust and prevent rust from forming permanently.

What’s more amazing is that you can apply this highly durable rust inhibitor to your equipment even during harsh weather and it will still do magnificently well!

And you can put it on anything you could think of, not just cars. Farmers can use it on sheds and bins and even oil companies can use it on their oil rigs in the sea.


Best Rust Inhibitor Spray for Cars

Now, you know some of the best rust inhibitor paints above, here are some of the best rust inhibitors spray for cars you can check it out:

8. CRC 06026 Heavy Duty Corrosion Inhibitor

CRC 06026 Heavy Duty Corrosion Inhibitor, 10 Wt Oz
1,463 Reviews
CRC 06026 Heavy Duty Corrosion Inhibitor, 10 Wt Oz
  • EFFECTIVE PROTECTION: Flexible corrosion...
  • HEAVY DUTY: Provides extended corrosion...
  • APPLICATIONS: Electrical connections...
  • PRODUCT SPECIFICATIONS: Heavy Duty Corrosion...

If you want an anti corrosion inhibitors spray for cars that can be easily applied, a spray type of product is the one you need to buy.

This one by CRC is a really heavy duty corrosion aerosol that can protect not only your undercarriage but also your engine components and electrical connections.

It works great against both humidity and salt spray, as well. Plus, it can preserve your metal surfaces for a longer period of time and can seal out moisture. Now, that’s a great product to try out.


9. WD-40 Specialist Long Term Corrosion Inhibitor

WD-40 Specialist Corrosion Inhibitor, Long-Lasting Anti-Rust Spray, 6.5 OZ
1,761 Reviews
WD-40 Specialist Corrosion Inhibitor, Long-Lasting Anti-Rust Spray, 6.5 OZ
  • Coats metal parts to lubricate and protect...
  • Recommended for preventative maintenance or...
  • Included straw creates a precision stream of...
  • Non-drying lubricant does not run and says...

But if you want longer lasting performance still, you should definitely try this one by WD-40. This product is part of their Specialist line which is made up of top-notch and high performing products specially formulated for professional use.

This corrosion inhibitor both lubricates your car’s metal parts and protects it from rust. This protective layer is also resistant to air and moisture.

You can definitely use this rust inhibitor for the car frame. Plus, it can last up to one whole year even when used outdoors regularly.


10. Fluid Film Lubricant/Corrosion Inhibitor

MowerPartsGroup Lubricant/Corrosion Inhibitor, 11.75 oz.
1,247 Reviews
MowerPartsGroup Lubricant/Corrosion Inhibitor, 11.75 oz.
  • 11.75 fl oz aerosol can
  • Always active, does not dry out
  • Provides long term protection against...
  • Provides superior lubrication and penetrates...

Protecting your auto from rust and corrosion is no easy feat and you will need a product that’s reliable. This one from Fluid Film is a good example.

It is a thixotropic liquid formulated from wool wax, refined petroleum oils, and other special ingredients that can combat against corrosive agents. It protects your metal parts by penetrating into hard to reach areas up to the metal’s base.

Plus, it’s solvent-free, non-toxic, and non-hazardous making it a safe product to use. It’s also made easy by its handy spray formula. So you can definitely use it on other projects making it the best rust inhibitor for steel.

Try it on things like mowers, tractors, power tools, and a whole lot more!


11. WD-40 Multipurpose Lubricant

WD-40 Original Forumla, Multi-Use Product with SMART STRAW SPRAYS 2 WAYS, 14.4 OZ [2-Pack]
9,577 Reviews
WD-40 Original Forumla, Multi-Use Product with SMART STRAW SPRAYS 2 WAYS, 14.4 OZ [2-Pack]
  • Get more versatility with the Original...
  • Deliver a precise stream, or a regular spray...
  • No slick substance is left behind
  • Helps prolong the use out of your tools,...

Known as the “can with thousands of uses,” WD-40 Multipurpose Lubricant is excellent at protecting metal from rust and corrosion.

If you need a rust prevention spray to quickly get the job done, this is the product for it.

Not only that, but this product also performs well on penetrating and free stuck parts, displace moisture, and lubricate just about anything.

Also, the WD-40 is excellent at driving out moisture and quickly dries out electrical systems to eliminate moisture-induced short circuits.

And if you have issues like sticky mechanisms, loosens rust-to-metal bonds, frozen or rusted metal parts, spray some of the WD-40 onto the stuck parts and it will instantly release the stuck.

You can also use this product for lubricates moving parts such as hinges, wheels, pulleys, rollers, chains, and gears.


12. BOESHIELD T-9 Rust & Corrosion Inhibitor

BOESHIELD T-9 Rust & Corrosion Protection/Inhibitor and Waterproof Lubrication, 12 oz.
4,233 Reviews
BOESHIELD T-9 Rust & Corrosion Protection/Inhibitor and Waterproof Lubrication, 12 oz.
  • Boeshield Is Great For Use In Marine,...
  • Loosens Rusty And Corroded Parts And Is Safe...
  • Flushes Out Dirt And Old Lubricants,...
  • Dries To A Thin, Waxy Film That Clings To...

This Boeshield’s anti-corrosion spray is excellent at lubricating and protecting metal components, especially aircraft. Not surprisingly, this product is developed by the Boeing Company as well.

What’s great about this rust inhibitor spray is that it combines anti-corrosion technology with waterproofing and lubrication. So, this 3-in-1 product is the best rust prevention spray for cars and all other types of vehicles; land, water or air.

The Boeshield’s T-9 solution works to loosen rusty and corroded parts while displacing dirt and old lubricants and working its way into moving parts for better lubrication. It dries to a thin, waxy layer that clings to the metal and protects it for months.

Also, another plus point for Boeshield’s T-9 is that it’s safe and can be used on any metal surface.


13. 3M Professional Grade Rubberized Undercoating

3M - 03584-6PK Professional Grade Rubberized Undercoating, 03584, 16 oz
  • Multi-purpose undercoating may be applied to...
  • Sound deadening properties help reduce road...
  • Asphalt-based product is excellent for wheel...
  • Protects the undercarriage of vehicles from...

When you’re buying from 3M, you know it is high quality. They’re not a well-known brand for anything less than excellent!

If you want to do a professional quality job without having to go to your local auto shop, the rubberized undercoating from 3M might just be what you’re looking for.

The rubberized undercoating formula of this 3M product creates a very durable protective barrier that not only seals out moisture but also pesky grit and grime that the road throws under your car.

Not only does it give amazing, long-lasting protection to your undercarriage, but you can also even use it on other parts of your car like wheel wells, door skins, floor pans, and even the underside of your hood and trunk lid.

It even protects from abrasion (and not just corrosion!). Now, what’s all-around maximum protection!

But it does more. This rubberized undercoating also has noise deadening properties that allow you to enjoy a smoother quieter ride. It has an excellent no-run formula so applying it will be quick, easy, and clean.


14. Permatex Rust Treatment

Permatex 81849 Rust Treatment, 10.25 oz. net Aerosol Can
  • Easily applied, just brush or spray it on
  • Destroys rust on all automotive applications
  • Within minutes, rust disappears and a durable...
  • Tough coating serves as an excellent...

Now, if you want a rust preventive primer, this one by Permatex is the one you need to get! It can destroy rust that’s already forming even in hard to reach places because of its convenient spray form.

What’s more amazing is that it creates an excellent black polymer coating that protects your undercarriage perfectly. Amazingly, this coating can also be painted over!

The advanced formula in this product is specially created for fiberglass and body fillers. You can use it in other machines like trucks, trailers, fences, decks, and etcetera.


15. H&M CB12 Corrosion Block

H&M CB12 Corrosion Block, 12-Ounce Aerosol Can
386 Reviews
H&M CB12 Corrosion Block, 12-Ounce Aerosol Can
  • Country Of Origin : China
  • The Package Height Of The Product Is 23.88...
  • The Package Length Of The Product Is 3.56...
  • The Package Width Of The Product Is 5.84...

The H&M CB12 corrosion block is a proven rust inhibitor primer that frees frozen metal parts, protects electrical systems and electronics from saltwater corrosion. It provides a thin protective film that is not sticky or will it attract dirt and moisture.

This rust inhibitor spray is also suitable to use on the engine block, evaporator coils, motor mounts and other components for all type of vehicles whether it’s land or sea.


16. LPS 3 Premier Rust Inhibitor

LPS 3 Premier Rust Inhibitor, 11 oz Aerosol , hazy brown - L00316
375 Reviews
LPS 3 Premier Rust Inhibitor, 11 oz Aerosol , hazy brown - L00316
  • Protects for up to 2 years indoors
  • Prevents rust and corrosion
  • Provides non-sling lubrication
  • Self-healing, soft, waxy film

The LPS 3 is an excellent rust inhibitor brands. This rust inhibitor primer spray is a specially formulated long-term corrosion inhibitor protecting metal parts in inside storage for up to 2 years!

When applied it forms a soft, translucent, waxy film penetrates and sealing out moisture, air, acid, alkali fumes, and other corrosive elements.

Also, LPS 3 is NSF Certified and is safe to be used in Candian Food Processing Establishments.


What is Rust Inhibitor?

So it’s been established that rust does form on your car, regardless of what you do. Inhibitors are formulated to slow down the process of oxidation when metal is exposed to water and oxygen.

Simply put, these products are the ones who can slow down rust from forming.

However, do take note that a rust inhibitor isn’t a rust remover. You might need another product entirely if you already have surface rust on your vehicle.

Also, watch this quick video below to learn how to clean your car to prevent rust:



Types of Corrosion Inhibitors

Since corrosion is an inevitable and naturally occurring phenomenon, there are many ways to slow down the process.

Modern technology has allowed companies to come up with different types of corrosion inhibitors that you could use (depending on your needs).

Here are some of the types of corrosion inhibitors that are already existing:

  • Anodic Inhibitors form a protective oxide film on the surface of the metal.
  • Cathodic Inhibitors slow down the cathodic reaction on the metal’s surface.
  • Mixed Inhibitors form a film-like structure while reducing both anodic and cathodic reactions.
  • Volatile Corrosion Inhibitors or VCI are compounds that are transported to a closed space and deals with corrosion through volatilization.


Electronic Rust Inhibitor for Cars

rust proofing car

This is important so make sure to read on! While it’s commendable that you want to protect your vehicle better and give it all the services it needs to have a longer life, make sure to do ample research when it comes to these kinds of services and tools.

You may have heard of electronic rust inhibitors before. Yes, they’re a thing! There are some auto sellers out in the market that is offering this service as an add-on when you’re buying a new car. When they tell you how it’s superior to common rust inhibitors, it does sound promising.

But don’t fall for it!

Electronic rust inhibitors use a process called cathodic protection. This process works by forcing a flow of electrons to wrap around the surface of the metal that needs protecting. You will need a complete electrical circuit for this to work.

And it does work but for boats only. The seawater allows the electrical circuit to be complete. Unfortunately for your car, the ground can’t do that so electronic rust inhibitors won’t protect your ride more than normal, hardware-bought ones. Unless you have a boat, it’s better to skip this!


Rust Prevention Methods

If you have other projects that use metal, then it’s a good idea to know some rust prevention methods. These are the most common rust prevention methods for steel. Read on below to learn a little more about some of them:

  • Rust-resistant alloys. Using rust resistant alloys like stainless steel can give your projects a protective layer against rust. Stainless steel has chromium content and chromium oxide is an excellent anti-rust shield.
  • Bluing. Bluing is primarily used on guns and is a coating process that uses a mix of potassium nitrate, sodium hydroxide, and water.
  • Plating. Plating is a labor-extensive and costly process that coats iron in zinc to prevent rust from forming.
  • Coating. The coating comes in different forms such as organic, powder, paint, and etcetera.
  • Regular Maintenance. Regular maintenance is the removal of formed rust and the application of a rust-resistant coating during frequent intervals.


Considerations When Buying a Rust Prevention Spray & Paint

rust prevention coating

Here are some of the essential considerations to think when choosing your rust inhibitor products:

  • The surface to be treated

Different type of rust inhibitor products is suitable for a specific surface. However, you can find the majority of the rust prevention and vehicle undercoating solutions can be used for fiberglass and body filler as well as metals.

  • Removal or prevention

When choosing the right automotive rust inhibitor for you, you have to know if you’re trying to get rid of existing rust, or simply prevent it from forming in the future. While most of the rust inhibitors in this list can perform both functions, but it’s always a good to double check.

  • To paint or not to paint

If you are planning to treat a visible surface, make sure you choose a rust inhibitor that can convert rust and also act as a primer, so you can easily paint over it. But you have to remember that rust converter will leave a dark brown or black surface behind. You might need to paint multiple layers to adequately cover it.

  • Paint or spray

Basically, rust inhibitor comes in two forms; paint or spray. If you do not want to work with an uneven surface or using a brush, then you should go with the spray option.


Corrosion Inhibition of Mild Steel Using Plant Extract

Recent studies have found that the leaves of the Hibiscus sabdariffa or the Roselle plant can form an acid extract that works well as a corrosion inhibitor of mild steel.

If successful, this plant extract not only can help with preventing rust to form but also a greener way to prevent corrosion from steel.

However, more studies are needed to be done to show if this West African plant can become a decent commercial corrosion inhibitor. Until then, we have to wait and see.

  • Updated March 6, 2019
James Evans

As a passionate outdoorsman and an automobile enthusiast, James spent most of his time in his garage tinkering with cars and bikes. During his free time, he loves to hike and blog about the things that he has done to keep his ride in tip-top condition.

Click Here to Leave a Comment Below 7 comments
David Ciglar - November 1, 2018

Rust Bullet beats por15 in all independent testing why isn’t it mentioned?

    James Evans - November 2, 2018

    Hi David, thanks for bringing this excellent product to our attention. We’ve added the Rust Bullet and updated the list!

Randy Tomak - February 9, 2019

KBS RustSeal and it’s three step system has proven in government testing “FAR SUPERIOR” to your #1 product and doesn’t make your list?

    James Evans - February 9, 2019

    Hi Randy. Thanks for bringing this excellent product to our attention. We’ll look into it and add to our list soon. Thanks!

Gabe - April 4, 2019

Sem Rust Trap is superior to por15 and and doesn’t require a fraction of the prep that por does. Just clean and paint.

    James Evans - April 4, 2019

    Actually, POR15 is similar to SEM Rust Trap.

    Randy - May 18, 2019

    Companies that promote & sell their products as a “system” consisting of a cleaner, prep, and coating (such as KBS or Pople) that work hand in hand are your best bet.


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