I recently finished a beech floor, applied the Osmo Hardwax, (first coat) and have started to apply the second coat, but I have noticed that the first coat has overlapping dark areas where I guess I applied to slowly as the edge was drying too fast… anyway, there are noticeable dark ares where this has happened. I have tried lightly sanding the overlap, but it makes no difference, also a second coat hardly makes a difference… do I need to sand completely and start again??? Help please.