First work the dent from underneath as usual until a plateau of effectiveness is encountered (Note: the reason this happens is because the corners are still holding the dent).
Second, use the Dent Dollie to knock down the high spots that are wrapped around the corner, and to release the stresses holding down the “flat spot”.
There are three different radius of Dent Dollies to best match the contours of body corners
Changing the strike angle can change the way and where the metal is raised.
-Start working light.