Most of the vehicle surface is metal whereas the bumper covers, mirror covers, mud guards, etc., are all plastic. Applying the same paint on plastic and metal can often result in a slightly different color appearance. This can be due to several factors. First, the plastic dissipates heat more slowly than metal (the paint dries slower), and drying time can be a key factor in paint appearance. As paint dries more slowly, metal flakes in the paint have more time to settle at different angles, and volatile chemicals have more time to evaporate causing slight variance in the paint color.Another factor is that plastic can hold more static electricity charge than metal and, if not properly discharged before spraying, can cause metal flakes to align differently than on a metal surface.Most modern factories use electrostatic spray equipment to paint the metal surfaces of a vehicle. While they use conventional spray equipment to paint the plastic surfaces. This will also cause paint color variations.As you drive today look at the bumpers on the cars around you. Even the most expensive cars bumpers will not match perfectly from the factory. We will do our best using proper spray and prep techniques to match the factory finish.