Depends on the severity of the dings. For relatively minor ones, I
use several grits of sandpaper, moving from coarse to fine until the
dings and scratches are almost gone. Then, after cleaning all the
grit away, I polish with greystar on my buffing motor.
For more severe damage, I’ll first try resurfacing with a bastard
file. If that isn’t working, I’ll go to my belt sander, being careful
to not alter the shape of the surface too much. Then, proceed as
Most important for hammers, don’t let them get too hot or they’ll
lose their tempering. I keep a small bowl of water nearby for
quenching when they get warm.