Lining paper

Lining Paper: Plain material, often paper, usually applied horizontal and used under wallcoverings to assure a smoother surface and better adhesion.
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Lining Paper: A special type of wallpaper that's used as a base for the decorative paper. Lining paper is often used to cover cracks and other imperfections in a wall.

Lining Paper - A wallpaper used to cover poor surfaces prior to applying paint or wallpaper - when being covered with wallpaper, the lining paper is normally put on at rightangles to the final paper.

Lining Paper. As the name suggests, this type does not give a decorative finish, it is used on bare walls and ceilings in preparation for painting or papering.

Lining paper: A plain, thin wall covering designed to provide a smooth surface for wallpaper or paint.
Malachite: A green-colored mineral used for ornamental objects.
Marbling: A decorative paint technique used to create the look of real marble.

A small wheel on a handle used to cut lining papers especially.
Caulk. (pronounced cork) Flexible filler in tubes.
Ceiling Texture. Usually known as artex in the UK. A textured finish with a wide variety of patterns.
China-wood oil.

Wallpaper is decorated printed paper sold in rolls for sticking on the plasterboard of walls. At least a sealer or lining paper should be used over the new plasterboard to prevent it discoloring the paper.
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There is lining paper that can be used but then you have to deal with the look of wallpaper seams if painted.
So again filling the gaps on the paneling is your best bet.
This will give you more options for treatment of these walls.

It's not as difficult as applying a skim plaster finish and it's much less prone to cracking but, done badly, it can look poor. The wall finish is similar to what you would get if painting onto lining paper (which is basically what you are doing) ...

See also: Home, Walls, Varnish, Size, Wallpaper