I don't know if your still looking for an answer on this... your post is pretty old. If not, maybe somebody else can use an answer.
Being new at this stuff myself, I'd been wondering about this too. I found somewhere, may have been this site, that you can use what's called a flattening agent in your clear to spray over the part you want flat black.
I haven't tried this yet myself, but hope to in the coming months.