Top coats and base coats play an important role in keeping nails healthy and color long-lasting. Base coats nourish the nail and can keep polishes from staining the nail. ... In addition, the base coat creates a smooth surface for the polish and help the polish adhere strongly to the nail.

Do you need a base coat?

A base coat helps the polish stick to the nail more easily; creates a barrier that protects nails from the damaging effects of the polish; prevents staining and peeling; and gives nails a more even texture. A base coat ultimately extends the life of your manicure.

Is base coat or topcoat more important?

According to board-certified dermatologist Dr. Kavita Mariwalla, M.D., it's more important to wear a base coat than a top coat. “If you don't wear a base coat, polish will potentially weaken and stain your nails, especially if you choose a dark color,” she tells Bustle.