Why does replacing the hood at a 4S shop require painting?

[ThomasLynn]

Hoods, doors, bumpers, etc., all need to be painted at the 4S shop because they are not painted during transportation. Automotive paint can be classified into the following three types: 1. Standard Paint: Standard paint is the most common type of automotive paint and has been around the longest. Its characteristics include low cost and simple application, but it lacks high gloss and surface hardness, making it particularly prone to scratches. 2. Metallic Paint: Also known as metallic flake paint, it contains fine aluminum particles in its base. When light hits these particles, it reflects off them, creating a sparkling metallic appearance. This type of paint gives a pleasant, light, and modern feel. 3. Pearl Paint: Also called mica paint, it operates on a similar principle to metallic paint but uses mica particles coated with titanium dioxide and iron oxide instead of aluminum. When light strikes the mica particles, it first takes on the color of titanium dioxide and iron oxide, then undergoes complex refraction and interference within the mica particles.