OPI Natural Nail Base Coat nail polish can be used under OPI Nail Lacquer shades. Promotes a longer-lasting manicure for optimal results and up to 7 days of wear and shine.Step 1. Start by applying OPI Base Coat to clean, dry nails with cuticles pushed back.Step 2. For a perfect polish, apply one stroke of nail lacquer down the center of the nail, followed by one stroke along each side of the nail.Step 3. Then apply a second coat of nail lacquer, pulling color over the tips of the nails.Step 4. Shine, seal, and protect with one coat of OPI Top Coat, pulling it over the tips of the nails.