Wow Ian, that was fast.
I’m not a cross country skier, but it is a very popular pasttime. I went once many years ago. The conditions vary from powdery after a storm, to hard packed and icy. Not much help huh. In the summer there are miles of flat trails along the ice roads to willy field and the ice runways. The castle rock loop is popular. It is a gently rising slope up to the rock then a steeper drop down to the ice edge. It passes the Kiwi ski fields and ends up on the ice shelf for a trip to Scott Base. The skis come off and its a couple of mile walk back to MCM. Cant help with the wax.