Nature Strong Botanical Base Coat base coat Nourish your nails with the two-in-one strengthening Botanical Base Coat. - The multi-functional Botanical Base Coat can be worn on its own and under Nature Strong's colour lacquers. - The natural base coat is enriched with gentle skin care ingredients to keep nails looking healthy and smooth. - OPI Nature Strong is OPI's natural VEGAN nail polish range that stays on and shines for up to seven days. To enjoy the entire Nature Strong range, use the natural Nature Strong Botanical Base Coat, Nature Strong Natural Colour Varnish and Nature Strong Top Coat.