here is a question

First I'm in Denver, a dry climate especially this summer

We have a double rocking chair made I think of ash that has been sitting
outside on the back patio. Each year I've given it a light sanding
and another coat of poly. Dispite my efforts parts of the wood have
turned black because water has gotten in.

An accedent split one of the arm rests this spring. I've taken the arm
rest and repaired it with urethane glue but I've decided that I need to
refinish the chair. The original finish was boiled linseed oil with
poly on top after it dried because that is what recommended by the
unfinished furniture place where we purchased it.

I'm in the process of taking the chair apart piece by piece and removing
the 8 coats of poly (one for each year). My benchtop belt sander is
really handy for removing the poly and the black stain. Now I'm
wondering how I should finish it. Should I go with the original boiled
linseed and poly or use something else.