Evens out the nail surface badly ridged nails impede the adherence of nail polish ridge filler evens out the ridges of the nail plate and gives a uniform and smooth nail surface perfect for polish to adhere to thereby enabling the polish to last longer how to use brush entire surface of the nail with ridge filler and let it dry before continuing with your regular manicure deep ridges may require a second coat in order to obtain a smooth finish allow to dry and continue with your manicure o