What should be applied to a nail before painting for better adhesion?

Applying a base coat to a nail before painting is essential for achieving better adhesion of the nail polish. The base coat acts as a primer that prepares the nail surface, creating a smooth and even foundation for the color polish. It helps to prevent staining of the natural nail by the pigments in the polish and aids in extending the longevity of the manicure by allowing the colors to adhere more effectively.

Using a top coat after the polish is applied is meant for sealing and protecting the color, not for preparation. A second layer of polish does not enhance adhesion but rather builds color, and a nail strengthener primarily serves to reinforce the structure of the nail rather than improve the bond between the polish and the nail plate. Therefore, the base coat is the critical step in ensuring that the polish adheres correctly and lasts longer.