I'm looking forward to trying this. You are right about the difficulty in matching metallics, and tech support at Cervelo says they don't sell touch-up or have a spec on it. I suspect the bikes are painted overseas, so that makes sense. Still, if I can get it smooth enough to blend with the rest of the surface I'll be a real happy camper.
In any case, thanks so much for such a thorough and helpful reply! That sounds really straight forward, I can't believe I never thought about tape! Does it really matter what kind? electrical, scotch, etc?