WHY UNDERCOAT YOUR CAR? Car Under-body is made of iron and comes in contact with plenty of water in the rainy season. It is always advisable to prevent rusting before it starts. Rusting can be prevented if a layer of chemical substance is coated on the iron surface. This would prevent water and oxygen coming in contact with the iron and therefore prevent rusting. For prevention of rusting in car, 3M offers a coating that is called 3M Under shield and 3M Body Schutz . These are rubberized coatings that cover the underbody of the car and isolate it from oxygen and water. This rubberized coating offers other important benefits like- > Sound deadening properties that gives you a quieter ride. > Prevents chipping of the metal surface. > Provides insulation, thereby helping to maintaining temperature inside the car. Once rusting starts, it is very ...