Just an FYI, another forum member (gergmon) came up to my house last year for us to apply the SN on his Ironman. He used only black but I recall him saying when it was all dry that it wasn't a true black, it was a bit more deep charcoal. I know most of the other VXers that used SN did just black, maybe some will chime in here and give you an opinion on the final color.
Hmmm...thanks for the info Kat. Definitely makes me think about going full black on the cladding. Hopefully someone chimes in with their experience!