What is the difference between factory paint and aftermarket paint for cars?

[NoraAnn]

The difference between factory paint and aftermarket paint for cars lies in their quality: factory paint is now applied using robotic arms, ensuring fixed parameters such as paint viscosity, resulting in high-quality coating; aftermarket paint is mostly applied manually, and the painting environment is far inferior to that of the factory, so the quality of the paint film is usually compromised after touch-ups. The paint applied on the car production line consists of four layers: the electrocoat layer, the primer layer, the basecoat layer, and the clearcoat layer. The electrocoat layer serves as the foundation, directly adhering to the metal body of the car, providing anti-corrosion protection; the primer layer is applied over the electrocoat layer, protecting it and enhancing corrosion resistance while also improving adhesion for the outer paint layers; the basecoat layer determines the color of the car body; the clearcoat layer primarily protects the basecoat, increasing hardness to prevent minor scratches and offering some anti-corrosion benefits.