Indiana PSI Nail Technician Practice Test 2026 - Free Nail Technician Practice Questions and Exam Preparation

Using a base coat is essential to prevent polish from staining the nail bed. A base coat acts as a protective layer, providing a barrier between the natural nail and the colored polish applied on top. This barrier helps to prevent pigments in the nail polish from penetrating into the nail plate, which can cause discoloration or staining, particularly with darker or more vibrant colors. Moreover, a base coat can improve the adhesion of the polish, contributing to a longer-lasting manicure.

While acetone and isopropyl alcohol are solvents that can remove polish and clean the nails, they do not offer protective features. An astringent is typically used to reduce oiliness and tighten the skin but does not fulfill the role of preventing staining. Thus, employing a base coat before applying colored polish is crucial for maintaining the health and appearance of the nail bed.