The key to having shiny paint is to create as smooth a surface as possible. Dull looking paint is often the result of an uneven paint surface due to scratching, oxidation, or bonded contaminants. After claying you’ll likely only see a difference in the paint when detailing an extremely neglected car.
The benefits of clay are much more obvious when feeling the paint surface.
Detailing clay is a powerful tool to use to smooth the paint’s surface. Clay was originally used by body shops to remove overspray on the paint’s surface. However, it also works to remove environmental fallout and rail dust which are common bonded contaminants.
Clay works similar to a razor by shaving off bonded contaminants from the surface of the paint. Detailing clay is an abrasive substance and is sold in different levels of aggressiveness. However, all detailing clay except aggressive clay when used with enough lubrication is completely safe and will not scratch paint.
When shopping for clay, it is advised that you shop by price. All clay is manufactured in the same factory under the same patent. Aside from color and abrasive level, there is little difference between the different brands of clay.
Claying like washing should be done from the top of your car down. Also, always rub the clay in straight lines preferably matching the direction of airflow over the car. Even if you are planning to polish your car, it is still recommended that you first use clay. Removing the bonded contaminants with the clay first will allow the polish to be more effective at leveling the paint.
Depending upon your local conditions, it should not be necessary to clay your paint more than 1 or 2 times a year.