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Rusty Undercarriage

Posted by Rodger Busse on

The Race is ON….

This customer is getting  his race car ready to go to the track. Here is a question from Eric about rust on his undercarriage.

I need to apply Rust Doctor to the undercarriage of my race car where most of the paint is gone and metal has surface rust.However the drive shaft tunnel is still painted and not rusted.  Will Rust Doctor adhere to the painted surface? If not, how long will it take to flake off before I can paint it?

Thank you for your time,


Hi Eric,

Thanks for your question. It is one that comes to us frequently and it’s great to check on it to make sure your project on your race car goes well.

After you have prepped your undercarriage with a cleaner/degreaser like Grease Doctor and rinsed it thoroughly, you can apply the Rust Doctor. The rust will convert to a black iron oxide surface with a clear primer on it. You can apply Rust Doctor over painted surfaces like the drive shaft tunnel. If there are any nicks or scratches, they will also turn black. You may then want to paint it as well. Scuffing the paint will help with the adhesion.

Good luck on your project Eric, and have a great racing season. Feel free to send us pictures of your race car. We always like to post pictures of our customer’s projects,( if you are OK with that). Just send a JPIG file and we will do the rest.

The Rust Doctor Team

As a reminders to all of our readers, Rust Doctor is bio-degradable, non-toxic, non-flammable and only requires water for cleanup. Rust Doctor is made in the USA.

If you have any questions about Rust Doctor or Grease Doctor, or wish to order, please visit our web page at

There is a great video on our home page explaining how Rust Doctor can get rid of rusty metal forever!

If you need technical assistance or wish to order our products, don’t hesitate to contact us.

Click FAQ to see if we have an answer to your rust questions.

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