On Sun, 17 Sep 2017 10:34:42 -0700 (PDT), "Gramps' shop"
wrote:

Son's siding has sizable woodpecker damage.
What would you use to fill the holes?


Define " sizable " in terms of biggest hole size and
in terms of the number of holes.
.. my first thought was to replace sections of siding -
but too many unknowns to even guess ..
Are you positive that it's woodpeckers doing all the damage ?
... and not just occasional woodpecker activity -
with red squirrels doing the most damage ?
John T.