I wallpapered over paneling in my den and it's still holding up well. I used a wall liner - a thick type of paper that is applied to the wall horizontally instead of vertically like wallpaper. It covers the grooves in the paneling so that when you wallpaper over the liner, the grooves are no longer visible. It worked like a charm. Most Lowe's, Home Depot or other paint stores carry the liner. Good luck!
We purchased an old house 17 years ago. It was paneled through out. I used sheet rock mud and filled in each groove. After it dried well, I sanded lightly and filled again. Then sanded lightly for a wonderful long lasting finish for paint or wall paper. I am a perfectionist and found one coat of mud did not completely conceal seams for light colred paper or painting. It is worth the extra effort!
We did in my parents trailer years ago. We just cleaned the walls really well, then I took putty and filled in all those lines in paneling, then wallpapered over the top of it, stayed for years.
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