Does a car need a full repaint if the primer is slightly exposed?

[DelBennett]

If there is only paint damage without any dents, simply applying putty and repainting the affected area is sufficient. A complete repaint is not necessary. Methods to determine if the primer is scratched: If the scratch is deep and your fingernail catches when sliding over it, it likely reached the primer. If the scratch color matches the car body color, it only affected the topcoat. Otherwise, the primer may be damaged. Obvious deformation of the car body is another indicator. Effects of touch-up painting on the vehicle: Color difference may occur after touch-up painting. Due to process limitations, the touched-up paint may peel off after a few years. DIY treatment methods: Use regular toothpaste - apply it in gentle circular motions on the scratch. Reapply after rain or car washing. This can reduce scratch visibility, act as a simple barrier, and prevent short-term rusting.