Rust prevention spray can, in theory, extend the life of your car. However, if you don’t get a high-quality product, the spray will essentially be useless. Of course, it’s not just about buying a good spray, but getting one that will be appropriate for your car.
In scouring the market for the best of the best, we were able to condense our findings to the 6 best options available. If you want something that will work well for your vehicle, read on as we dive into some rust prevention spray reviews!
A Quick Look at the Winners of 2021
|Best Overall||BOESHIELD T-9 Rust & Corrosion Protection||
|Best Value||Rust-Oleum Automotive Rust Reformer Spray||
|Premium Choice||WD40 Long-Term Corrosion Inhibitor Spray||
|Permatex Rust Treatment||
|Fluid Film Powerful Rust & Corrosion Inhibitor||
The 6 Best Rust Prevention Spray for Cars
1. BOESHIELD T-9 Rust & Corrosion Protection – Best Overall
The Boeshield is a 12-ounce can that is completely waterproof. You can use the spray on everything from road vehicles to bicycles, boats, and RVs. The chemicals work by loosening stuck on rust and corrosion so that they can be easily rubbed away by hand.
It can penetrate beneath the surface, bringing up moisture, dirt, and other impurities that can cause serious harm to the quality of your car frame over time.
Once the solution has hardened to a waxy consistency, it will cling to the surface of your vehicle for months. Last, but not least, the Boeshield also has pedigree on its side. This can was developed with Boeing to deliver an aircraft-grade quality performance.
Unfortunately, the can itself isn’t nearly as good as the oil. Many report that theirs stopped working while there was still a quarter or so of the solution left. Of course, how you store and use the can may have an impact on its life expectancy.
2. Rust-Oleum Automotive Rust Reformer Spray – Best Value
The Rust-Oleum is the best rust prevention spray for the money. It’s a 10.25 ounce can that benefits from an extremely affordable price tag. The spray bonds instantly to the surface of your car for fast results, reversing rust, and allowing you to paint over corroded surfaces. It even features a comfort spray tip that will make using the can slightly more ergonomic.
Unfortunately, the Rust-Oleum does not have longevity on its side. The spray will peel off over time, especially under rainy, wet conditions. Of course, because it is so affordable, the cost of reapplication will be somewhat more manageable.
3. WD40 Long-Term Corrosion Inhibitor Spray – Premium Choice
The WD40 is a high-end, 6.5-ounce bottle that benefits from a huge life expectancy. A single application will last for at least two years, making it one of the longest-lasting products on the market. The spray is compliant with the environmental regulations of all 50 states and works even in extreme environments. This includes high humidity and dampness, both weather factors that can undo rust mitigation methods.
The big issue here is the price. Not only is this the most expensive bottle on our list, but it also is somewhat lacking in the department of value. At just 6.5 ounces, it is one of the smaller options featured here.
4. Permatex Rust Treatment
Permatex is a moderately priced rust treatment method that comes in a 10.5-ounce can. Within minutes, the waxy solution forms a waxy coat that destroys rust on any automobile. The shield can then be sanded and painted over.
The temperature range is significant—the solution can work in situations ranging from 50-90 degrees. Unfortunately, longevity is the real problem here. You will need to frequently reapply the spray to make sure you get the results you are looking for.
If you are willing to continuously replace the spray, however, this is an effective option for your needs.
5. Fluid Film Powerful Rust & Corrosion Inhibitor
The Fluid Film is an 11.75-ounce can. As with most sprays, this unit is fast-acting and can be applied in humid, or wet conditions. When the solution dries, you will be able to sand and paint over the coating for further utility.
Unfortunately, the can itself is very low quality. Spray pressure is limited from the moment you start using it and only diminishes over time. Many found that the spray component stopped working entirely well before the solution itself was exhausted.
6. STA-BIL Rust and Corrosion Inhibitor Spray
The Sta-Bil is an affordable 13-ounce can. Not only does the spray prevent rust but it also penetrates beneath the surface to eliminate dirt, moisture, and other contaminants that can jeopardize the health of your automobile.
Unfortunately, there are several problems to be wary of. For one thing, the spray does not work long at all. Many report that they have to regularly reapply the spray for it to function. It is also better for prevention than for removal, which may not be a problem for everyone. However, if you want something that maximizes the versatility factor, this won’t be it. Ultimately, the spray is serviceable but does not compete very well with some of the other products we’ve highlighted.
You’ve seen our top 6 products, but if you aren’t completely sold, it may help to contemplate a few special considerations. Read on for some factors that will help you determine the value of a rust prevention spray.
As with most aerosol-based products, rust prevention spray will have an optimal temperature range. In general, solutions do not work very well in extreme temperatures. If you live in an extreme climate, there may be special options that are more optimized for your needs.
A typical range might be somewhere between 40-90 degrees. However, you should note that this refers only to the moment of application. Once the solution has dried, it will be significantly less vulnerable to changing temperatures.
Temperature isn’t the only environmental factor that can work against the effectiveness of a spray bottle. If you live in an area that experiences lots of rain, or high levels of humidity, you will need a spray that can accommodate these conditions.
Many of the sprays featured on our list today work well, even in hot or humid situations.
Your car probably isn’t the only thing in your life that you want to keep rust-free. Fortunately, many sprays can be effectively used on anything from patio furniture, to boats. Pay attention to the approved uses of your can. If the product is indoor/outdoor, this typically means it can be used in many situations.
Better yet, many sprays will specifically list out all possible applications, removing uncertainties.
Rust prevention sprays aren’t usually extremely expensive. While the amount you spend will ultimately depend on the size of your car—with larger vehicles typically requiring more spray—you can still coat an entire ride for $20 or so.
The cost will depend on the special features you want (durability, longevity, etc.) you can still establish a baseline budget at this rate and count on getting good results.
The price of a can only tells you so much. You also need to pay attention to the quantity of the can. The more ounces you get, the more value the product has. However, there is a flip side. Once you’ve started using a can, it will only last for so long before it begins to lose pressure. Consequently, you don’t want to get something bigger than you will be able to use over the course of a few months.
Durability of the Coating
When your car has suffered rust, you don’t just want to slow down the problem—you usually also want to cover up the damage it has done. Consequently, some sprays can be easily sanded so that they can be painted over smoothly.
If you plan on treating the finish of your car, you will definitely want something that can handle a new paint job.
If you are concerned with the appearance of your vehicle, you may find it worthwhile to invest in something that comes with a built-in primer. The primer will help lay down a protective coating that also enhances the appearance of your car metal, should you decide to paint over the waxy layer. Not only does primer extend the life expectancy of a paint job, but it also adds vibrancy to the color.
While many of us don’t worry about the criminality of something so simple as a can of rust prevention oil, the truth of the matter is that where you live can severely limit your options. Several states with prohibitive environmental restrictions are very particular about the type of aerosol cans they will allow.
Make sure the product you decide on is in compliance with your local laws.
For truly thorough results, you should invest in a product that can penetrate beneath the surface.Oils that can meet and lift contaminants will go a long way towards improving the health of your automobile. They may cost a little bit more, but the added expense will be well worth it.
Some sprays last for weeks or months, while others provide a thick, waxy coating that will survive for years. The longer the oil works, the more value you get from your spray can.
If you have arthritis, or you just favor an ergonomic lifestyle, there are products out there for you. Look for cans that feature easy press spray nozzles. The less pressure you have to apply to the nozzle, the less strain will be put on the joints of your hand. Though not common, this feature will be very important for some users.
Now it’s your job is to choose between the great products we’ve highlighted here. Are you the kind of buyer that wants to get something they know will work well over time? If that describes you, our top choice, the BOESHIELD T-9 Rust & Corrosion Protection will probably be a compelling pick.
However, buyers on a budget aren’t without options either. If you need to save money, go with our runner up, the Rust-Oleum Automotive 248658 Rust Reformer Spray.
- A Quick Look at the Winners of 2021
- The 6 Best Rust Prevention Spray for Cars
- Buyer’s Guide