This is to support a GWR bench, where the two cast iron ends are screwed to wooden battens about 500mm x 100mm, since otherwise they would lack stability and leave rust stains.
I used pine last time and painted it with Sadolin. This has lasted 8 years outside and is still reasonably sound. As I'm refurbishing all the wood and the slats themselves are oiled oak, I have bought two more pieces of oak to use as feet, replacing the pine.
Should I paint with Sadolin, or just use teak oil to match the slats? Will oiled oak be ok in contact with the ground?