As for the color/masking sequence, flip a coin; unless there's white involved I don't think which goes on first matters.......
I'd recommend you consider thinning the Smoke and a very light application to start. I don't have a lot of experience with it but have found it "darkens" the finish more then expected. If you start light you can always add more if required; hard to go back the other way.
Looking forward to your next update.
Cheers,
Lance



