How to Replace Baseboard Molding | HowStuffWorks- finishing nails for floor molding ,Nail the shoe molding into place with 2-penny finishing nails driven through the molding into the floor; set nails about 12 inches apart. Sink all nails with a nail set. Fill all nail holes in both shoe molding and baseboard molding with plastic wood, and let dry.How to Nail Quarter-Round Baseboard | HunkerStep 3. Position a 1-1/4-inch finishing nail at the middle of the molding two inches from the end. Hold the nail so it is nearly perpendicular to the floor. Hammer the nail through the quarter-round and into the baseboard with a hammer. The finishing nail is thin enough to not split the quarter-round and long enough to anchor the molding.