Which of the following actions is a crucial step in nail preparation before applying tips?

Removing the shine from the nail plate is a crucial step in nail preparation before applying tips because it creates a better surface for adhesion. The natural shine on the nail can prevent the adhesive used for the tips from bonding effectively, leading to a higher likelihood of lifting or detachment after application. By properly buffing or filing the nail surface to eliminate the shine, you enhance the mechanical grip between the natural nail and the artificial tip, ensuring that the latter adheres securely and lasts longer.

Other actions, while they may be beneficial for overall nail health or aesthetics, do not play as significant a role in the adhesion process specifically. For example, massaging the hand does not contribute to the tips' adherence. Cleaning the nails with soap and water is important for hygiene but does not affect the bond strength. Applying a base coat of polish is a step taken after the tips are applied, rather than during the preparation phase. Therefore, effectively removing the shine is the key action that directly impacts the success of the artificial nail application.