What is feathering caused by?

Feathering is typically caused by the uneven application of paint or finish, resulting in a soft, blurred edge that resembles the soft edges of a feather. It can occur due to excessive thinning of the paint, using the wrong brush technique, or inadequate surface preparation. Environmental factors, such as humidity and temperature, can also contribute to feathering by affecting the drying times and adhesion of the paint. Proper technique and preparation can help minimize this issue.