If you live in an area with severe winter weather, then the salt and antifreeze solutions that are placed on the roadway to prevent ice will eventually cause the undercarriage of your car to rust. Rust is toxic to the structural integrity of your vehicle's frame and is something that you need to take steps to proactively prevent its spread and destructive growth. The best way to prevent rust on the underside of your car is to apply an automotive anti-rust undercoating spray using an air compressor and an inexpensive spray nozzle you can purchase at your auto parts store.
Follow these steps to properly apply the undercoating spray to your vehicle:
Step 1: Dress Appropriately for the Job
Since rust undercoating sprays are rubberized, they tend to stick to your skin and make a mess. For this reason, you should wear all of the following protective gear when working under your car with them:
- a hat
- a face shield
- rubber gloves
- a long sleeve shirt
- denim pants or overalls
- work boots
Step 2: Prepare the Car for Application
To apply undercoating, you need to jack up your car and place it on jack stands. Make sure you use a level area that is well ventilated. Once you have the car on the jack stands, then remove all four tires and pressure wash the wheel wells and under the vehicle. This step is important because it removes any road grease or built-up grime on the undercarriage and wheel wells that will interfere with the paint's ability to stick.
Step 3: Prepare the Paint for Application
Shake the can of paint you will be using very well. Screw the spray gun attachment onto the top of the paint can and attach it to your air compressor. Set the pressure on the spray gun to a lower setting for a nice, thick application that will not require touch-ups.
Step 4: Apply the Rust Undercoating Spray to the Car
Using a steady back-and-forth method like you would when you paint your home with an air sprayer, apply the rust inhibitor spray to each of the four wheel wells of your car and along the entire undercarriage. Change cans when necessary, and make sure that you get a complete coverage to prevent moisture intrusion.
Finally, if automotive DIY isn't something that you feel secure about tackling yourself, then you can take you car to a local auto body shop and they can easily put it up on their rack and spray the undercarriage with a rust preventative.