What could be a reason for the paint run in a new spot repair?

A paint run in a new spot repair typically occurs when the application of paint is inconsistent, often characterized by excessive layers of paint applied too densely in one area. When the gun is moved too slowly, the spray pattern causes more paint to accumulate in one spot, leading to the formation of runs. This slow movement allows the paint to build up instead of creating a smooth, even surface.

Additionally, while other factors can contribute to problems with paint application, they involve different aspects of the painting process. For example, operating the gun too quickly might lead to uneven coverage rather than a run, while excessive solvent could affect drying times but not necessarily create a run directly. Improper thinning of the paint could also cause application issues, but it is more likely to lead to problems like sagging or poor adhesion rather than runs specifically. Thus, moving the gun too slowly results in an excess of paint in one area, which is the primary mechanism for paint runs in a spot repair.