Yes, you understand correctly. The way in which ink adheres to the foil depends on the printer, in all the time i´m with that kind of models sometimes the ink adheres very strongly and some others not so strongly but always enough to do its work pretty well. If you work with a professional copier, usually they have several modes. In every mode the machine applies some hot when printing. The warmer it does, the better ink adheres over the silver ink but there is a limit when working with adhesive paper because if too hot is applied the sheet can get wrinkled and plenty of bubbles. You have to test it. Remenber that we are talking about black lines over silver ink. Any other detail colour have to be painted or printed over white paper or card and this won´t give you any adherence problem. I always mark the black lines of the panels in the same way that i do rivets but with a striker pin or with a ballpen that doesn´t write. That makes the panelling more real and it doesn´t matter if ink takes out because the marked line will be there. In fact, the lines only show you the way to mark or to put rivets alongside. (The engine of the caravelle is an exception, it is not marked and no rivets have been applied. Only the printed black details over the silver paper as in normal card model). Remember that you have to use very glossy and thin white adhesive paper (like used in normal stickers). Adhesive paper is more useful that cardstock printed also in silver. The reference for printing is pantone silver (i don´t remember the number but there is only one).