dunno who wrote this.. prolly a quote from i-club hehe.. But it should answer your question.
When Should I Wax My Car?
At least 97 percent of today's vehicles come from the factory with clearcoat finishes. Clearcoats contain stabilizers, ultraviolet light blockers and UV light absorbers that help keep vehicle paints looking new longer by preventing oxidation—the chemical breakdown of the upper layer of paint film caused by sunlight, moisture and contaminants in the air.
But clearcoats themselves need attention, too.
"Clearcoats can give drivers a false sense of security by appearing to protect the underlying base coat," Matthew Broderick, group vice president of marketing at Turtle Wax Inc, told Carpoint.
"Clearcoats are fragile and susceptible to scratches, abrasions and swirls. When a clearcoat surface is scratched and pitted as a result of not waxing, the light can't reflect evenly off the surface, which makes the paint look dull."
Most manufacturers recommend that you wax your vehicle twice a year to protect it from damage and maintain the color and shine. Some auto-care suppliers recommend monthly waxing.
"Ideally, a vehicle should be waxed three to four times per year," according to Pennington, to maximize the protection provided by the wax. "A good strategy is to start right before the winter and get on to a three-month cycle."
Waxing your vehicle will help remove paint oxidation and surface dirt, while adding a protective coating. Wax will improve or remove minor damage such as surface scratches or light contaminants and provide a high-luster finish. Again, consult your vehicle's manual for specific recommendations.
The Waxing Process
Basic guidelines to bear in mind:
The paint surface should be cool and not in direct sunlight.
Always wash the vehicle immediately before waxing.
The temperature should be above 50 degrees Fahrenheit and the humidity should be low.
Apply the wax to a small section at a time using either a foam pad or small terry cloth towel.
Apply the wax in overlapping strokes or circular motions.
Wait for a section to dry to a haze before wiping the wax off with soft, terry cloth towels or cloth diapers.
Wipe in both directions, turning the towels often.
Shake the towels to remove accumulated wax.
When finished, wipe the entire vehicle again, paying particular attention to the edges of trim pieces, door jambs and moldings where excess wax may have accumulated.
For additional shine between wax jobs, several manufacturers offer spray-and-wipe products to quickly enhance the vehicle's shine, such as Turtle Wax Emerald Series Premium Detailer and Meguiar's Quik Detailer.
If your vehicle's paint has been damaged, the paint may need additional work requiring the use of other types of products. You should consult a professional detail shop, auto paint repair shop, or car care product manufacturer for advice before using any products that contain abrasives.