OPI Base Coat – The Perfect Start to Every Manicure Create the perfect foundation for beautiful, longer-lasting nails with OPI Base Coat. This professional-quality base coat helps nail lacquer adhere better, smooths the nail surface for even colour application, and helps protect natural nails from staining. An essential first step for a salon-quality manicure at home or in the salon. Key Benefits: Extends the wear of your nail polish Helps prevent staining from darker shades Smooths and prepares the nail surface Professional OPI formula Suitable for natural nails Pair with your favourite OPI Nail Lacquer and finish with OPI Top Coat for a glossy, durable manicure.