Paint runs occur when too much paint is sprayed onto a panel during the painting process, and it collects in a feature (for example, a contoured recess for the door handle) and then dibbles down, causing the run.
It is rare, but not unheard of, for cars to have runs from the factory. However, we most commonly see runs on cars that have had resprays. A good bodyshop would flat-and-polish out any imperfections such as runs and sags, but typically the cars we see with runs were not repainted at good bodyshops.
Written by Danny Argent. Last updated 16/06/2022 15:35