7 Best Auto Rustproofings – Reviews & Buying Guide

Best Auto Rustproofing

One major factor that shortens the lifespan of a car or its parts is rust. Even though modern paints are designed to provide a complete seal above the underlying metal surface, with time rust will start appearing, especially if you drive on coastal areas where it is humid and salty.

Because of this, it is important to rustproof your car every once in a while, on the exposed parts and for this, you need auto rustproofing.

Basically, this is a paint-like chemical that is applied directly over the rusty parts so as to seal them permanently and prevent further damage.  

For this, however, you need the best auto rustproofing and here is a close up look at the best ones in the market.

7 Best Auto Rustproofings – Reviews

1. 3M 03584 – Rubberized Auto Rustproofing

Editor's Rating: 4.5 out of 5 stars (4.5 / 5)

3M 03584
  • Type: Spray
  • Color: Black

In addition to having rustproofing properties, this product has a rubberized formulation that gives it sound-deadening properties, making it ideal for use on wheel wells to silence any vibration noises from loose parts.

The product is actually asphalt-based and creates a black protective coating that can be applied to bare or primed metal on cars, RVs, trucks, boat trailers, etc.

However, before application, any rust, dust or grease must be removed from the surface so that the protective coating adheres firmly to the surface.

Once this prep is done and the coat is applied, it dries in approximately 60 minutes to seal out grit, moisture, and grime, which would otherwise corrode the metal surface further. It can also be sealed with paint, primer or polish to enhance its finish.

Another benefit you get with this product is that it gives you the convenience of aerosol spraying, which simplifies the application process and allows you to apply the coat without buying any other equipment.


  • The rubberized formulation gives sound-deadening properties
  • Can be applied to bare or primed metal
  • Seals out moisture, grit, and grime
  • Can be sealed with paint, primer or polish
  • Easy to apply


  • The surface must be prepared before application
  • Takes a long time to dry (1 hour)

2. POR-15 45104 – Lead-Free Auto Rustproofing

Editor's Rating: 4.4 out of 5 stars (4.4 / 5)

POR-15 45104
  • Type: Paint
  • Color: Clear, Silver, Gray, Gloss Black, Semi-Gloss Black

Though quite expensive, this product consists of a lead-free formula that is very safe for the environment and also safe to use.

Packed in a 1-quart paint can, the product comes in 5 different colors, which are clear, silver, gray, gloss black, and semi-gloss black. With these, you can get a matching color for your car’s exterior so as to build a protective layer around each of the rusting parts.

Unlike other rustproofing chemicals, with this 45104, you do not need to prepare the surface before application. You can apply it directly on the rust and this simplifies its use.

After application, the product dries up to form a non-porous finish that is rock hard and won’t crack or chip later to expose the metal inside.

However, since it is packed in a paint can, you need to buy an additional brush for doing the application.


  • Lead-free formula
  • Available in 5 colors
  • No surface preparation required
  • Forms a rock hard non-porous coating that does not crack or chip


  • Expensive
  • An application brush is required

3. Rust-Oleum 248659 – Good Auto Rustproofing

Editor's Rating: 4.2 out of 5 stars (4.2 / 5)

Rust-Oleum 248659
  • Type: Spray
  • Color: Black

Coming in black color, this product is designed to instantly convert any rusted surface to a protected paintable surface, which means you can apply any colored paint that you want afterward so as to match the rustproofed part with the vehicle’s exterior.

This makes it highly versatile and the coat formed prevents future rust because it is very tough and durable.

Application is also quite easy because this rustproofing features an any-angle spray with a comfort tip, which is simpler and faster to use as compared to the brush application method.

Also, you do not have to sand or prepare the rusted surface before application and this makes the use of this product much simpler.

However, the spray comes in a very small 8-ounce container, which can only be used to rustproof a few surfaces before requiring a refill.


  • Paintable
  • Creates a durable coat that prevents future rust
  • Any-angle spray with comfort tip for easy application
  • Surface preparation is not required


  • Small quantity

4. Rust Bullet 8.56084E+11 – UV Resistant Auto Rustproofing

Editor's Rating: 4.5 out of 5 stars (4.5 / 5)

Rust Bullet 8.56084E+11
  • Type: Paint
  • Color: Metallic Gray

This auto rustproofing creates a UV resistant finish once applied to any rusted surface and therefore, the dried-up coat does not fade or crack. Also, no top coat is needed because this kind of protection is sufficient and highly durable.

That said, the product comes in a metallic gray color, which means that a top coat is required if your car’s exterior is painted in any other color.

Additionally, since it comes in a paint can, an application tool such as a brush is required for the job. On the bright side, the rustproofing solution can be applied using a brush, roller or even sprayed using automotive spray systems, which diversifies its application process.

Other features include coming in a large 1-quart can, having a chemical resistant formulation and requires little or no surface preparation before application.

NB: For the best results, a minimum of 2 coats should be applied to the rusted surface.


  • UV and chemical resistant
  • Topcoat not required
  • Applicable via brush, roller or sprayer
  • Large quantity
  • Little or no surface preparation required


  • Application tool is required

5. CRC 06026 – Cheapest Auto Rustproofing

Editor's Rating: 4.3 out of 5 stars (4.3 / 5)

CRC 06026
  • Type: Spray
  • Color: Amber

CRC’s 06026 has affordability as its main advantage and despite this, it is a very versatile product that can be used on critical car components such as rusty electrical connections, fasteners, motors, steering linkages and the like.

This is because it creates a long-term corrosion inhibitor that is very flexible, which resists salt sprays and high humidity, thereby providing a durable and reliable protective coat.

Though it is packed in a relatively small 10-ounce container, the container is actually a spray can, which means the application is quite easy and no extra application tool is required.   


  • Affordable
  • Ideal for critical car parts such as rusty electrical connections and motors
  • Creates a long term and flexible, corrosion-inhibitor finish
  • Resistant to salt spray and high humidity
  • Easy to use


  • Small 10-ounce container

Editor's Rating: 4.6 out of 5 stars (4.6 / 5)

Fluid Film Lubricant/ Corrosion Inhibitor, 11.75 oz.
  • Type: Spray
  • Color: Orange

When it comes to sprays, this aerosol rustproofing from Fluid Film stands out as the best due to a number of reasons.

For starters, the product’s formulation is based on lanolin, which is non-toxic and therefore, it is eco-friendly and safe to use.

No solvents are contained in the formula but instead, it has a specially processes wool wax, top refined petroleum oils and a few agents that penetrate deep into the metal base of the rusted part, then form a fluid protective film around it

The spray is also a lubricant and corrosion inhibitor in one, which gives it multiple uses apart from just rustproofing.

Additionally, being a spray makes the application process very easy and no extra tools are required for this process.

Combined, these features make it the top-rated auto rustproofing in this review. However, the spray can is quite small, giving you only 11.75 ounces of rustproofing, and it comes in an orange color, which does not blend easily with other colors.


  • Non-toxic lanolin-based formula
  • Penetrates deep into the metal then forms a protective film around it
  • Lubricant and corrosion inhibitor in one
  • Easy to apply


  • Small quantity
  • Orange color does not blend easily with other colors

7. Boeshield 122182 – Boeing Auto Rustproofing

Editor's Rating: 3.9 out of 5 stars (3.9 / 5)

Boeshield 122182
  • Type: Spray
  • Color: N/A

The brand behind a product does say a lot about the item’s quality and considering that this 122182 made by The Boeing Company, shows it is a high-quality auto rustproofing.

Boeing actually made this spray for lubricating and protecting aircraft components from rusting, but it can be used on cars, delivering the same quality of rustproofing for the eroding parts.

Basically, the product works by loosening rust on the corroded metal sections while also flushing out dirt, moisture and old lubricants. In the process, it penetrates deep into the rusted metal but does not affect pure metal, paint, vinyl and plastic surfaces.

This penetration is made possible by its paraffin wax and solvent carrier formulation, which is also safe to use on electrical components, ignitions, connectors and the like.

After spraying, the product dries to form a thin, waterproof, waxy film that adheres to the rusted metal for months, after which a new coat will be required. 

Other features include a 12-ounce packaging, in which it comes in an aerosol can that makes the application process very easy.


  • High-quality formulation that is usable on planes
  • Loosens rust and flushes out dirt, lubricants, and moisture
  • Penetrates deep into the metal
  • Does not affect paint, plastic, and vinyl
  • Forms a thin, waxy and waterproof film


  • Needs to be applied afresh after some months

How to Buy the Best Auto Rustproofing

How to Buy the Best Auto Rustproofing

#1. Surface

One of the most important things to check before buying auto rustproofing is the surface it can be used on because this has to do with compatibility.

Though they are designed to get rid of rust on metallic surfaces, it is inevitable that the product will encounter either paint or a different material such as fiberglass, fillers and the like. If it is corrosive to such surfaces, then it will end up doing more damage than good.

Ideally, the best automobile rust inhibitor should be universally compatible with all surfaces, and act only on the rusted surface so as to coat and restore it.

#2. Removal or Prevention

Another important thing to check is whether the product eliminates the rust before coating the metal, or it simply covers up the already formed rust so as to prevent further damage.

Rust removers are better for thick metallic parts such as on the engine block because removal of the top rust layer won’t really have any effect on the engine.

However, for thin metallic parts such as the exhaust pipe, it is better to use a preventive coat that covers up the existing rust so that you do not thin it out much further.

#3. Spray or Paint

These are the two basic types of auto rustproofing and each has its own benefits. Sprays are much easier to apply and can be used to reach deeper into hidden crevices so as to create a protective coat over the whole area.

However, they leave behind a thin film that can wear off easily and therefore, respraying may be required every now and then.

On the other hand, paint rustproofing is the heavy-duty type because it creates a thicker protective coat that is more durable. However, applying such a coat requires you to buy an additional brush or roller, and the process is not as easy as spraying.

It is recommended to use paint on heavily damaged parts and after the coat dries, spray the whole area so as to give a full protective coating even to the hidden sections.

#4. Application

As stated above, spraying is much easier and faster as compared to brushing and therefore, if you want to finish off the rustproofing job quickly without any hassle, buy a spray type rust inhibitor. Otherwise, paint rust inhibitors will give you a more durable coat.

#5. Color

Lastly, you should check the color of the inhibitor, and especially if you will be applying it to an external surface on your car. This is because the final coat should match or blend in with the rest of the car.

Ideally, you should buy a color that matches your car’s color but you may also go for a paintable rust inhibitor, in which you can paint your respective car’s color after the rustproofing coat dries up.


Rust prevention is really important for the well being of your car. Though modern paints and car finishes are designed to prevent such kind of corrosion, older vehicles are more likely to experience this and therefore, if you own a vintage, better have an auto rustproofing close by.

That said, newer vehicles are not completely immune to rust and if you spot any such brown spot on your car, then pick your best auto rustproofing from the list above to do early damage prevention.