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MAINTAIN the factory undercoating. The W140 is undercoated and shielded (wheel wells, motor, etc.)to the Nth degree! The sound deadening is also superior. Spraying ruberized asphalt all over will not help the sound deadening and will allow rust to start underneath. Inspect the under body at least once a year and repair any defects in the factory undercoating. You may also want to spray on a wax type rust preventative every fall on areas that have paint/corrosion coat instead of the undercoating. This stuff does help prevent rust and washes off in a year or so so that it does not trap water and salt.
 
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