The undercarriage of a car is prone to rusting. Rust does not usually accumulate or cause rotten floor pans after a few years, but over a period of decades. To repair a rusted undercarriage, not only does the rust need to be stopped, it must be prevented from reoccurring. Otherwise, the repair will need to be repeated in a few years.
- Skill level:
Things you need
- Wire brush
- Jack stands
- Paint brush
- Rust doctor
Park the car on a flat surface, and raise it with a jack. Place a jack stand near each front tire under the frame of the car. Lower the jack so the car sits on the jack stands.
Lay down, and crawl underneath the car, looking up at the undercarriage. Use a wire brush to brush away and remove all loose rust from the surface of the undercarriage.
Brush on the Rust Doctor product with a paint brush. Cover all of the surface of the undercarriage so the metal is no longer visible. A second coat may be necessary. The liquid will begin turning black once painted on the metal. This is the result of the liquid and the rust reacting to create a barrier against moisture.
Wait a full day before driving the car, allowing the undercarriage to dry without chipping or cracking.
Tips and warnings
- Always wear protective safety goggles when removing rust from a vehicle. Rust Doctor is the only automotive rust product designed to be applied directly on top of rust without previous deep cleaning. It forms a bond to seal out moisture. It is also available in gallon and five-gallon size containers for large jobs, such as undercarriage repair.
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