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Overspray is any airborne contaminant, usually from the result of painting projects or industrial fallout that is capable of blowing and landing on any surface, such as your vehicle. Although most people define Overspray in conjunction with paint and industrial fallout, overspray can also include bugs and road tar.
Having Overspray on your vehicle prohibits sealants and waxes to penetrate the clear coat, which means less protection from the elements of the earth, such as sun, rain, etc..