I wouldn't use pure carnauba wax (like the block pictured above). it's simply too hard to be applied easily, and for wax to be effective it needs to be buffed and penetrate any defects in the wood/finish. Any spreadable carnauba wax will have distillates in it, or else you couldn't apply it. Thick pastes are better than liquids--lower % of distillates in them. When an auto wax says "100% carnauba," that means that there are no other types of wax in it, NOT that it is pure carnauba wax (which is hard as a rock!).
And on a side note, although most people here get it, a few simply won't pay attention to what their eyeballs see, so here it is once again: it is spelled C-A-R-N-A-U-B-A.