Nowadays many architects prefer to leave the acacia wood withot treatment of surface and let it to greyed out natural way.
Recently on market there appeared many suppliers who deliver artificial imitation of terrace and facade decks which is called woodcomposite material. They often argue about maintenence free of these decks, but it is always only imitation of wood and we can doubt about its appereance and quality. According to our idea artificial imitations do not belong to gardens and countryside.
If you are lazy to repaint your terrace every year let it greyed out and it will always be natural wood, which will fit in your garden. Examples of using acacia wood can be found among our products.