What it is: A ridge-filling primer that doubles as a nail-loving base. What it does: One coat helps conceal bumps and unevenness to create a smooth foundation. How to use: Start with clean nails. Apply one thin, even coat to bare nails. Wear alone for a natural, matte look, or follow with 1 to 2 coats of polish (sold separately) as a final touch. Sulfate-free; formaldehyde-free; toulene-free; DBP-free; camphor-free; barium sulfate-free; ethyl tosylamide-free; acetone-free; benzyl benzoate-free Made in the USA