How to Determine if the Primer is Damaged?

[OAbigail]

Methods to check if the car's primer is damaged are as follows: 1. Visual inspection: Typically, white cars have black or gray primer, while dark-colored cars have the opposite. 2. Finger touch test: If your fingernail catches noticeably when running over the scratch, it indicates a deep scratch that likely reaches the primer. Additional information: Car paint consists of several layers from inside to out: the electrophoretic layer (primer), intermediate coat, color coat, and clear coat. The so-called 'primer' is actually a protective film applied to the bare metal car body through electrophoretic chemical treatment, primarily to enhance the body's anti-corrosion capability. Generally, white cars have black or gray primer, while dark-colored cars have the opposite.