I am seeking a clear finish for a bench made of 3" slabs of pawlonia. I'd like to keep the light wood color as much as possible, though recognize it will grey with time. Fungus may also be a problem, so a fungicide in the finish may help limit growth. I have tried Renaissance wax but am unsure how well this will hold up. I expect very occasional use of the bench however - it is more a garden folly than a seating amenity. Thank you!