What typically causes runs and sags in a spray paint finish?

Holding the spray gun too long in one place leads to runs and sags in a paint finish because this technique allows too much paint to accumulate on the surface. When the spray gun is stationary for an extended time, the paint tends to run down due to gravity, resulting in unevenness in the finish. The key to preventing runs and sags is to maintain a consistent motion while spraying, ensuring that the paint is distributed evenly across the surface. This approach minimizes excess build-up and helps achieve a smoother, more uniform finish.

While other factors can influence the quality of a paint job, such as the quality of the paint, gun distance, or cleanliness of the spray gun, they do not specifically cause the runs and sags that occur from improper technique. Focusing on proper gun motion and movement is crucial for an optimal spray application.