nail primer

Some primers are dual-purpose formulas that act as a base coat and a treatment. Look for products that list proteins (for example hydrolyzed keratin), vitamins or strengthening extracts—these can both prime the nail for polish and be used alone to help strengthen and treat nails.

Most listings and reviews report extended polish wear of about one week (commonly up to 7 days) when these base coats are used.

Common warnings include flammability/combustible cautions and instructions to keep the product out of reach of children. Some product details also note the presence of formaldehyde or formaldehyde-donor ingredients. Always follow the label directions and safety guidance on the product.

Base coats often act as ridge-fillers and concealers: they even out color and texture, smooth dings, dents and ridges, and create a more uniform surface for polish application.

They help extend polish wear and improve durability, strengthen nails to reduce breakage and peeling, protect brittle nails from chipping, and hydrate or nourish the nail to improve texture and flexibility.

Available finishes include glossy and smooth natural sheens, sheer or semi-sheer looks, and in some cases a demi-matte concealing finish designed to prep and even the nail surface.