It has a certain antirust effect. As a tool for repairing automobile scratches, touch-up pen can be used to repair, cover up and fill tiny scratches or paint drops. Paint can fill the gaps in the space, block the contact between air and the surface of the car body, and has a certain anti-rust effect. But I still suggest painting. If the touch-up pen is used for a long time, the damaged paint surface will fall off. If you want a better antirust effect, paint it. It is inevitable that some bumps will occur when the car is driving outside. Sometimes in the process of car washing, the car paint may be scratched. There are many ways to touch up the paint, among which using a touch-up pen is also a method. As a tool for repairing car scratches, the touch-up pen can instantly treat car paint, which is convenient and fast. Scratches on ordinary cars can easily hurt the paint layer, that is, the paint surface on the surface, so it is inevitable to touch up the paint. If it is a slight scratch, you can touch up the paint with a paint pen, but the paint pen only touches up the color paint. If the primer is directly damaged, the paint pen will be difficult to repair. It is recommended to go to 4S shop or professional repair shop for paint repair.