It's a rust-preventive.Use direction: cars, trucks, tows, trailer, petrol tank, undercarriage etc.
Remove loose old lacquer and rust and sand the surface.

The surface should be clean, dry and free of grease. The aerosol should have room temperature. Best processing temperature 15 to 25°C. Before use, shake the aerosol for 2 minutes and spray a sample. Distance to the surface to be treated approximately 25 to 30 centimetre.

Apply the undercoating in several layers.

After use,

clean the valve (turn aerosol upside down and press the nozzle for approximately 2 seconds).