Good old days
Many years ago I was painting the inside of a CC cabin cruiser. Yacht paint, I don't recall brand. The old timer in the paint shop at the boat yard taught me to add 1 tablespoon of household ammonia as a mold preventative. That thickened the paint so I thinned it back down with turpentine. The paint was in good shape for many more years, no mold. This was an older boat (1950) without great interior airflow.
The same thing might work with a clear, oil based finish that you might put on your pine wall. Otherwise, I'd stick with a (oil) sealer intended for outdoor use. Keeping varnish looking good can be a chore every few years.
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