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Undercarriage rust is a car owner’s nightmare—is there anything you can do about it yourself? It turns out that removing rust at home is actually a pretty straightforward process with a little elbow grease. We’ve put together a thorough guide to cleaning your undercarriage, applying rust reformer, and preventing future rust that will make car rust removal a breeze. Read on to get your undercarriage looking good as new!

2

Elevate your car with a jack.

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  1. A hydraulic or scissor jack will work—just make sure the jack and jack stands have a weight capacity of at least 50% of the car’s weight. Use the jack to lift the car and place jack stands underneath the frame to hold it up.
    • Consult your vehicle’s owner’s manual for the best jack placement.
    • Keep your jack stands nearby while you lift the car so you can quickly place them.
    • If you’re de-rusting a truck, it may already be high enough off the ground without jacks. Otherwise, dealing with rust under a truck is the same as under a car.
3

Scrape or brush away loose rust.

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  1. Slide or crawl underneath the car on your back and start scrubbing—use a wire brush, a metal scraper, or sandpaper (you can even add a wire brush attachment to a drill). Remove as much rust as you can so your anti-rust treatments have a metal base to cling to.[2]
    • Soda blasting or sandblasting the surface rust can also be good options for optimal removal.
    • Wear goggles to prevent rust flakes from flying into your eyes. For maximum safety, keep them on for the rest of the rust treatment process, too.
    • It’s OK if you don’t get 100% of the rust off manually. You’ll be adding liquid removal agents after this step.
    • If there is deep rust (rust that has weakened the metal or caused holes to form), take your car to an auto shop for professional treatment or to get a replacement part. It's not possible to remove this kind of problem at home.
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7

Prime the dry undercarriage with a rust converter.

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  1. Look for a high-quality rust-inhibitive primer—some are sprayable and some need to be painted on. Rust converter covers any rust spots you missed and turns them into paintable surfaces.[4]
    • You’ll probably need multiple coats to thoroughly coat everything. Read the primer instructions to know how long to wait between coats.
    • Primer helps your rust reformer stick to the metal under your car.
    • Rust converter primers are available online or at most hardware or auto shops.
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10

Pressure wash your undercarriage regularly.

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  1. Wash it thoroughly before winter to prepare it for corrosive salt and other harsh conditions. During winter, wash your car as often as you can on warm days, including a pressure wash on the undercarriage. Wash again at the beginning of spring.
    • Your car is most vulnerable to rust in the spring because of the moisture in the air and the fluctuating temperatures.
    • Aim to wash your car every 10 to 20 days during winter if you can.
    • Drive as little as possible before, during, and after winter storms when there’s extra salt on the roads.[5]

Expert Q&A

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  • Question
    What's the basic process for removing rust on a vehicle?
    Tom Eisenberg
    Tom Eisenberg
    Auto Technician
    Tom Eisenberg is the Owner and General Manager of West Coast Tires & Service in Los Angeles, California, a family-owned AAA-approved and certified auto shop. Tom has over 10 years of experience in the auto industry. Modern Tire Dealer Magazine voted his shop one of the Best 10 Operations in the Country.
    Tom Eisenberg
    Auto Technician
    Expert Answer
    Sand off the rust, prime the surface, then repaint it. However, if you have rust on a body panel, take your vehicle to a body shop. Avoid trying to repair it yourself or you could mess up the body panel. If you just have a little bit of rust on a steel bumper or something similar, though, you could fix it yourself. Just be sure to use automotive paint that matches your vehicle.
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Tips

  • If your undercarriage is too severely rusted, you’ll have to replace parts (especially thin body panels) or have it professionally treated.
  • The sooner you treat rust, the less it will spread and damage your undercarriage.
  • Try talking to your car dealer about rustproofing your undercarriage before the rusting process begins.
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About This Article

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Co-authored by:
Auto Repair Expert
This article was co-authored by Charlie Payne and by wikiHow staff writer, Dan Hickey. Charlie Payne is an Auto Repair Expert and the Owner & Operator of Perfect Reflections Auto Body. With over 21 years of experience, he specializes in auto restorations and collision repairs. Charlie is PPG and DuPont certified and earned a Bachelor's Degree from Liberty University. This article has been viewed 84,368 times.
19 votes - 95%
Co-authors: 6
Updated: June 1, 2024
Views: 84,368
Categories: Rust Stain Removal
Thanks to all authors for creating a page that has been read 84,368 times.

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    Aug 23, 2023

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