At what minimum outdoor temperature should oil-based paint be applied to exterior surfaces?

Oil-based paint should be applied to exterior surfaces at a minimum outdoor temperature of 40 degrees Fahrenheit. This temperature ensures that the paint can properly adhere to the surface and dry effectively. If applied in temperatures lower than this, the paint may not cure properly, leading to issues such as poor adhesion, surface imperfections, and extended drying times. Additionally, cooler temperatures can affect the viscosity of the paint, making it harder to apply evenly and resulting in a finish that could be less durable over time. Therefore, 40 degrees serves as a critical threshold to ensure optimal application conditions and lasting results.