Nail Foundation Flawless Basecoat is the perfect primer for your colour application. It is formulated to protect nails from stains, and fill ridges for a smooth nail surface. The satin finish creates a velvety base for colour, and the fast dry formula means no wait time between basecoat and lacquer application. Butter London does not add formaldehyde, toluene, or DBP to any of its nail formulas. It’s colour without compromise.