The sliding hammer is more powerful for repairing dents, conquers large dents. The principle is to stick the glue sticks on the dent and use tools that pull the tabs and lift the dent. Different loops for different dent pullers or slide hammers, works with all glue pullers. The large dent will need a slide hammer or a puller, a small dent puller or a pull bridge. Use a sliding hammer or a dent puller or other pulling tool to lift the dent and try to do it several times.