If you think about it, we paint over "lines," as well as paint from the previous session, all the time.
Most of us use some for of lines to place and sketch out intended subject before we start with colors. In effect, we're making lines with something (pencil, charcoal, thinned paint) and then, as time and our painting goes along, we cover them all successfully with paint -- whether that paint is dry (pastel) or wet (oil, acrylic).
I have heard, though, that over time, plain old lead pencil marks will blead up through the paint. Don't know if this is true.
I usually use vine charcoal, then wipe it off, which leaves a ghost of the image/drawing. Then, I redraw over this with a thinned raw umber/yellow ocher (or some other grayis mix), which leaves a fairly prominent line, which becomes covered and obliterated as the painting goes along. I've never had one of these beginning lines bleed up through the work.
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