Remove the problem, don't cover it up. I am taking that and several
other things into consideration.

The problem is a corner fascia that is water rotted, not badly and the
board end is still correctly cornered, but enough to see if you look
hard -- not just a passing glance -- or are a few feet away from it.

Most everybody has some rear high corner of the house that is well
shaded and stays rain-wet a long time, and also this is at the roof on
the high end of the second story of a split-level and is the least
visible portion of the whole house.

The fascia is ten foot lengths of 1 x 6 and i know what it is like to
try and handle and nail that length of fascia that high since i
replaced all the fascia on that end of the house it some years back.
(And it ain't some years back to my body now so i don't even want to
consider that. :-))

The place is almost impossible to get to and i will have to have the
ladder in a very awkward spot on a hill. (with all kind of supports
to keep it from slipping back and down the hill.)

Anyway, the ladder will be easier and ultimately safer than working
from the roof itself and hanging over on the downward pitch to get to
it.

Anyway....... My idea is to get the ladder secured in position and
assess the problem upclose, then caulk it up a bit, THEN put a short
piece of cut down to 1 x 6 size of cement fibreboard over it, run 4
screws in, putty over their heads and caulk and knife smooth the edges
of the overpiece for water runoff and then paint that.

There is no problem with the soffit directly underneath/behind it
which is one reason I say it is external.

Ideas?

FACE