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Cupronol. To manage your expectations it requires repainting in the future. Colours will notice the most.
Idk about cupronol on posts, but a mates parents did all their panels and posts in a standard tan wood colour and I was taken aback at how well the concrete posts blended into the fence panels - basically looked like wood posts unless you looked closely. However, my guess is you only get to choose the colour once. As removing it will be impossible.
Does anyone have any particular oil/stain/paint recommendations for painting my new fence please ? Ideal if I could do the concrete posts in the same substance - Sage green for preference