What it is: A top coat that delivers a powerful dose of plant-based strength.What it does: Apply a layer of Top Coat for extra high shine and a color-protective layer. OPI Nature Strong is OPI's first natural origin nail lacquer, which lasts up to seven days of wear and shine. Use your natural origin nail polish shade with Nature Strong Top Coat for extended wear.What else you need to know: 9-Free* and cruelty-free. *US Only. Plant-based ingredients sourced from nature. Long-lasting, high-shine finish.