Will the touch-up paint on a new car show differences after a few years?

[QuinnMarie]

Will the touch-up paint on a new car show differences after a few years. Reasons why it can't match the original paint: After a car is repainted, it cannot achieve the same effect as the original. The factory-applied paint is high-temperature paint with excellent hardness because the car body is empty during baking, allowing temperatures to reach several hundred degrees. During touch-up painting, the car body has many components and equipment, making high temperatures impossible—only around 50 degrees Celsius—so the paint hardness cannot match the original. Layers of car paint: The paint applied on the automotive production line consists of four layers: the electrophoretic layer, primer layer, base coat layer, and clear coat layer. The electrophoretic layer is the "foundation," directly adhered to the metal car body, serving as anti-corrosion. The primer layer is applied over the electrophoretic layer. During application, the entire car body frame is fully immersed in a large pool filled with paint; the primer layer protects the electrophoretic layer and enhances corrosion resistance.