OPI Nail Lacquer OPI is the No. 1 salon brand. Professionals and consumers can rely on OPI for classic, iconic shades, like I’m Not Really a Waitress, or fi nd new favorites from OPI’s rendsetting collections. When used in a professional service, Lacquer can last up to seven days. Technology OPI Lacquer is formulated using superior ingredients, including solvents and coloring agents, to provide a high-quality professional service with a two-coat application that delivers smooth, even wear. How it works This proprietary, long-lasting formula optimizes wear and shine for results that last up to seven days when used following OPI’s Lacquer Application protocol: proper Natural Nail Prep, Base Coat, Lacquer and Top Coat application.