In the end I used two coats of Osmo hardwax oil and the floor boards that were splintered and peeling were still very rough after applying the finish. I never found a solution I'm afraid.
I need to finish an old floor that I think is parana pine. Most of the floor boards are in good condition but a few of them are splintering and peeling as you can see here:
I would really like to finish the floor with wax to make it easy to repair later scratches and to get a natural...