Dark Wax is such an amazing product and is used to age your pieces beautifully. One tin of dark wax will last you a very long time. I am still using the same tin of wax after two years.
Don't be afraid to use it and always remember that if you apply too much dark wax you can always wipe it off by dabbing some clear wax on a rag and removing the excess. Remember that dark wax is a stain. So if you apply it and don't use the clear wax first it will be there to stay.
Wax is water repellent and can be used on any wooden surfaces