Hi, finally something I can give advice on!!!
I used to be in museum conservation and we used to prepare our own wax dressings and found that if you add a little grated carnauba (about 5% by volume) to you basic wax and turpentine/white spirrit will do mix this gave a very hard finish that was durable and could be left matt or would buff to a brilliant polish however if left to the elements will give a dull but tough surface coat if you get the mixture right.
http://en.wikipedia.org/wiki/Carnauba_wax
http://www.poth-hille.co.uk/orders-quotes
Cheers
James