The "Ding-King" is similar to a tool body shop use for dent removal. They will remove some dents but not all. Paintless dent removal is the only way to go, no hot glue applied to the paint. If the dent is in/on a body line or creased there is no getting it completely if at all.
I dont recommend hitting the body directly with a steel headed "Ford wrench"(hammer)
Quality glue pullers & other dent removal tools