Wyoming State Board Cosmetology Practice Exam 2025 - Free Cosmetology Exam Questions and Study Guide

The correct choice, which is to use a top coat, is based on its primary function of enhancing the longevity of nail polish. A top coat is a clear varnish applied over colored nail polish to provide a protective layer that helps prevent chipping, fading, and wear. This additional layer not only seals in the color but also gives a glossy finish, contributing to the overall appearance of the manicure while providing durability.

In contrast, a base coat is applied before the nail polish and serves to create a smooth surface for the polish to adhere to, while also protecting the nail from stains. Nail strengtheners are formulated to improve the condition and strength of the natural nail itself, rather than preserving the durability of the polish. Cuticle oil is used to moisturize the cuticles and surrounding skin, promoting healthy nail growth, but it does not have any effect on the longevity of the nail polish. Thus, the role of a top coat is specifically aligned with extending the wear time of nail polish, making it the right choice for this question.