- Undercoating is a thick paintlike substance that is applied to the bottom of a vehicle. It adheres to the metal and blocks water and salt, which can cause rust and rot the underside of a car.
Undercoating also reduces road noise inside the car. Drivers with sophisticated audio systems will sometimes use undercoating to improve the sound. - Undercoating is available in spray, brush or roll-on form. You can use any of these methods at home. All three types can be found at automotive supply stores.
Brush-on undercoating is the easiest to apply. It is very thick and tarlike, resulting in few drips and runs. Roll-on undercoating makes the job faster, but it can be hard to reach some areas with the roller. Spray undercoating is easy but requires more equipment. A mask, spray gun, air compressor and air hose are needed. - Raise the car and place the front end on jack stands--make sure the surface is level and flat. Once the undercoating is applied to the front and middle of the car, lower the front and raise the rear of the car to do the back section. Use side-to-side motions with a spray can.
No matter which type of undercoating you are using, it should be applied to all metal surfaces in an even coat. Don't apply undercoating to the oil plug, wires or electrical connections, or the exhaust pipes.
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