Why is it important to remove all traces of oil from the nails before applying polish?

Removing all traces of oil from the nails before applying polish is essential because oil can create a barrier that interferes with the adhesion of the polish to the nail surface. When polish does not adhere properly, it can lead to chipping, peeling, or lifting shortly after application. This lack of adherence means that the polish won't bond effectively, resulting in a less durable finish. By ensuring the nails are clean and free from oil, the polish has a better chance of forming a strong connection, which ultimately enhances the longevity and appearance of the manicure.