Which of the following can contribute to a poor finish, aside from spray gun distance?

Temperature and humidity significantly influence the quality of a sprayed finish. When the temperature is too high, the paint can dry too quickly, leading to issues like poor adhesion and uneven texture on the surface. Conversely, if the temperature is too low, the paint may not flow or cure properly, which can also result in an undesirable finish. Humidity plays a similar role; high humidity can cause paint to dry more slowly, allowing for potential contamination and imperfections as dust settles on the surface before the paint has dried.

Therefore, maintaining optimal temperature and humidity levels during the application process is crucial for achieving a smooth, professional-looking finish. The other factors listed, such as altitude, choice of music, and color of the paint, do not have the same direct impact on the spraying process itself. While altitude could affect spray patterns in very specific environments, it is not as commonly influential as temperature and humidity.