What is one of the key purposes of using a base coat?

One of the key purposes of using a base coat is to protect the nails from staining. Base coats create a barrier between the natural nail and the colored polish that is applied on top. This is particularly important because certain nail polishes, especially darker shades, can contain pigments that may lead to discoloration or yellowing of the nail when left in contact for prolonged periods. By applying a base coat, you effectively minimize the risk of stains, ensuring the natural nails remain healthy and maintain their appearance.

While improving nail strength, adding shine, and making polish removal easier are also important aspects connected to some base coats, the foremost function of the base coat is to protect against staining, which can be critical for maintaining the integrity and aesthetic quality of the natural nail.