I just found these capitols that came out of an old tobacco auction house. They are laced with nails that were cut to remove them. I wanted to saw them down but a local guy said there were far to many nails to remove. So I came up with the idea of using them for outdoor benches and I wanted to know is there a good finish I could use to preserve them? I use oil finishes for my inside work. What ideas are there I could use? I am forging metal feet for them so the will sit 6" off the ground.