Can a touch-up pen be used for exposed primer?

[IvanLee]

Exposed primer cannot be repaired with a touch-up pen. Damage that reaches the primer is relatively severe. If no anti-corrosion treatment is applied before painting over the damaged area, the new paint will not last long, and the car's metal body may start to corrode and rust from the inside. A touch-up pen is a tool for repairing minor car scratches. Simply choose the appropriate model that matches the original car paint color. After applying the touch-up pen to small scratches or areas where the paint has peeled off, it can repair, conceal, and fill in the damage. The components of a touch-up pen are typically the original car paint, and since car models vary, only a dedicated touch-up pen can be used for each specific car model.