Ok I'm not sure if anyone has done this but. polishing your new brake lines
It's very easy I done it on my HQ as we'll and they just stay shinny without polishing
I get the green stuff with I think a yellow line down it. Make your line and simply rub it with 600 sandpaper, rub it with never dull. Then rub away with a soft rag and done. It does not take long at all.
Photo 1 shows after I've rubbed the lines

Photo 2 shows a lil bit I polished. Photo isn't the best but u get the point