Which of the following is a method for enhancing nail polish adhesion?

Applying a base coat or nail primer is a recognized method for enhancing nail polish adhesion. The base coat serves as a foundational layer that helps to create a smooth surface for the polish, which can lead to better adherence. It typically contains ingredients that bond with both the nail and the polish, reducing the risk of chipping and lifting. A primer can also fill in ridges and imperfections on the nail, leading to a more even application of the nail polish.

In contrast, using a top coat, while important for protecting the polish and adding shine, does not improve adhesion directly; it is intended for use once the nail polish has been applied. Soaking nails in water can weaken the nail structure temporarily and may reduce polish adhesion, as it can cause the nails to become softer and more prone to chipping. Avoiding any nail care products would leave the nail surface unprepared, decreasing the likelihood of successful polish adhesion. Thus, the use of a base coat or nail primer is essential for fostering a strong bond between the nail and the polish.