Buying Guide: Best Car Corrosion & Rust Inhibitors for Maintenance

One of the most unpleasant realities of owning a car is corrosion. Besides the fact that rust can cause some serious damage to your car, it obviously is an eyesore. As a car owner, it is important to understand how rust forms on your car, which parts of the vehicle are more susceptible to corrosion, and the type of climate where corrosion is more likely to thrive.

Our Top 10 Best Performing Car Corrosion & Rust Inhibitors For The Money (2017)

our editor's rating based on value & performance - links below let you check prices at Amazon
PRODUCTPRODUCT NAMEEDITOR RATING
Evapo-Rust ER012 The Original Super Safe Rust Remover - 1 GallonEvapo-Rust ER012 The Original Super Safe Rust Remover - 1 Gallon (4.8 / 5)
Evapo-Rust ER013 The Original Super Safe Rust Remover - 5 GallonEvapo-Rust ER013 The Original Super Safe Rust Remover - 5 Gallon (4.8 / 5)
As11 Fluid Film 11.75oz Spray CansAs11 Fluid Film 11.75oz Spray Cans (4.8 / 5)
POR-15 40204 Metal Prep - 1 quartPOR-15 40204 Metal Prep - 1 quart (4.7 / 5)
CRC 06026 Heavy Duty Corrosion Inhibitor, 10 Wt OzCRC 06026 Heavy Duty Corrosion Inhibitor, 10 Wt Oz (4.7 / 5)
Corroseal 82331 Water-Based Rust Converter, GallonCorroseal 82331 Water-Based Rust Converter, Gallon (4.6 / 5)
Corroseal 82320 Water-Based Rust Converter, QuartCorroseal 82320 Water-Based Rust Converter, Quart (4.6 / 5)
Rust Converter ULTRA, Highly Effective Professional Grade Rust Repair (1 Gallon)Rust Converter ULTRA, Professional Grade Rust Repair (1 Gallon) (4.4 / 5)
Permatex 81849 Rust Treatment, 10.25 oz. net Aerosol CanPermatex 81849 Rust Treatment, 10.25 oz. net Aerosol Can (4.4 / 5)
Rust-Oleum Automotive 248659 8-Ounce Rust Reformer BottleRust-Oleum Automotive 248659 8-Ounce Rust Reformer Bottle (4.3 / 5)

How Corrosion Is Formed

Corrosion involves anodes, cathodes, and electrolytes — scientifically speaking. The process of corrosion is similar to the process of the electrochemical cell. In layman’s terms, corrosion is the breaking down of materials as a result of a chemical reaction. In other words, it’s a process of metal oxidation.

Iron is the main material of a vehicle, and can be oxidized in the presence of water and oxygen to form iron oxide. The iron oxide is the reddish-brown substance that we refer to as rust. Rusting on our vehicles occurs when the metal parts are exposed to elements such as salt or water resulting in a chemical breakdown.

On the body of a vehicle, rust can occur as a tiny nick in the paint, a raised paint bubble, or a small blemish. If the process of corrosion goes unnoticed, it can result in massive degradation. However, if it’s detected early, the process can be stopped.

Rust Prevention

The first step in rust prevention is to understand how it’s formed and which parts of your car are most likely to corrode. The most common — and most effective — method of preventing corrosion on the metal exposed portion of your vehicle is through the use of rust inhibitors. A rust inhibitor is an additive to the moisture that surrounds the iron.

The most common method of application of rust inhibitor is known as rust-proofing. Rust-proofing oils the car and prevents the oxidation of iron and the eventual formation of rust. There are several types of rust inhibitors. These include:

  • Electronic rust inhibitor. This is the latest entrant into rust proofing technology. Electronic module rust proofing entails the installation of a small device in your car that transmits a weak electric signal in the metal portion of the car thus preventing it from rusting. The device is known as an electronic module.
  • Drip oil spray. Experts highly recommend drip oil spray method of rust proofing. To apply drip oil spray, you’ll have to drill a few holes on the parts you want to rust-proof to make sure they are well oiled. The car may continue to drip the oil for one or two days after application. Expect a few stains on your driveway.
  • Dripless oil spray. Dripless oil spray is a thick, wax-like substance applied to the exposed metal portion of a car to prevent corrosion. The oil spray hardens after application, and there is no dripping afterward, hence the name dripless. It has a high viscosity and does not reach some areas of the car that need rust proofing.
  • Tar-based sprays/sealant. This method of rust proofing is also known as undercoating. Tar-based spray method involves the application of the tar-like substance on the exposed parts of the vehicle such as the underbody, wheel wells, floor pans, etc. Tar-based spray hardens upon spraying creating a permanent shield against rust causing elements such as salt and moisture.

Rust can be found on virtually any exposed metal portion of the car. However, some areas are more prone to corrosion than others. When inspecting your vehicle for rust, pay close attention to the exhaust system, trunk, engine, chassis, frame, fenders, and the wheel. Be sure to inspect the entire car, though.

Why You Need a Rust Inhibitor

A vehicle is a huge investment. Just like most items used on a daily basis, sooner or later your car will start to exhibit signs of wear and tear. One of them is corrosion due to road salt and moisture. If ignored, damage due to corrosion will only spread to other parts of the vehicle leading to serious damages. You can avoid such a situation by having your car rust-proofed via any of the above methods at least once in a year.

What to Consider Before Buying Rust Inhibitors

All of the methods of rust-proofing described earlier have been proven to be effective in rust prevention. However, there are some considerations to be made before making a choice on which one to use on your car. Take a look:

  • Environmental regulation. We all have a duty to protect the environment and leave a better planet for our children. This is why you’ll find a lot of local environmental regulations on paintings and coatings. Inquire about environmental regulations in your region before you purchase a rust proofing spray.
  • Price. Whatever options you choose to go with has to make a financial sense. How much will it cost you? How long will it last? Is there need to re-spray the vehicle after the first application? Understand your options.
  • Check online reviews. Nowadays, one of the best methods of knowing what products work best and which ones don’t is by way of reading online reviews. Check feedbacks from people who have used the product before. Or, check out our list of recommended products up above!

The exposed metal portion of our vehicles is likely to get corroded due to exposure to moisture and salt. Protect your vehicle from corrosion with a rust inhibitor. The best rust inhibitor should not only safeguard your vehicle from corrosion degradation, but should also be environmentally friendly.

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