Just what I have heard about what Mike told you about using a liner. A friend of my sisters did just that, later on the liner got sucked into the grooves of the panelling. She even filled in the grooves, then the liner. The lines still came through the paper. I would use a heavy 'vinyl' paper with a good print. Sure it may show later but would still look find. My friend in Virginia did his and I never knew it was panelling.