Now, using a small amount of
all-purpose joint compound and a 2” putty knife, fill in the dimple caused by
the hammer. Carefully smooth over the dimple with the putty knife.
Let the joint compound dry, lightly
sand, and finally touch up the wall with a little paint.
If the joint compound shrunk or the
area is still not to your satisfaction, then use a 3” or 4” wide drywall knife
and add a thin skim coat over the nail area.