Product Overview Treat your nails to the TLC they deserve with Nicole by OPI 3 In 1 Base, Top Coat & Strengthener. This 3 in 1 nail treatment is everything you need it to be for gorgeously healthy nails; a base coat for long lasting nails which won’t stain, a strengthener for strong, lusciously long nails, & a top coat to guard against chips. What more could you want? Use the exclusive OPI Perfect Stroke brush for even easy application. This long-lasting 3 in 1 formula is free from harmful formaldehyde, DBP & toluene for healthy happy nails.