It's a goner.
Shame, as the XMT line was one of my favorites.
I don't know that there is an exact replacement.
The new McKees line has a new wax, but it's more similar to the old DP Max Wax.
I'd have to say the most similar wax would be Poorboys Natty Blue.
XMT 180 is a bit harder, but seems to have similar look and longevity.
Give it a try.