~ To smooth out uneven patches due to the filling process, sand the entire floor. Use a 60-grit sandpaper and attach it to a pole sander. Sand the floor at least twice in opposite directions to ensure that the floor is completely smooth. Also, make sure all the dust and debris has been cleared out.
~ Do not allow the floor to get wet after this process. If it does, you must wait for a minimum of 24 hours, or until it dries completely, before proceeding further.