A ridge filling basecoat, 3 Free. Make up for your nails. This silk-finish, stain resistant basecoat provides the perfect foundation for butter LONDON 3 Free lacquer. Matte results so beautiful, you can wear it alone. This treatment hides and smoothes tiny ridges and imperfections in the nail. It is like cover-up, or foundation make-up for the nail. It leaves a silky, matte finish when used alone. This makes it an excellent product for MEN who want an invisible, but immaculate manicure. When used as basecoat, it provides a beautiful, smooth surface on which to paint. This will give a wonderful result to the look of your lacquer.