Lol if he were to remove the paneling and replace it with drywall he would have to caulk the top n bottom spaces, mud the imperfections, and sand for a good solid finish. If u wana do it the cheap way you should still mud the grooves, sand the entire wall for a smooth surface, stain if necessary then paint 2 coats. Anything else would come out cheap looking or probably peel eventually if u use wallpaper
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