How To Waterproof Wallpaper?

I wanted to add some color into my new kitchen, but the guy at the tile store ixnayed using color tiles for my backsplash - concerned about resale value. My parents had this amazing wallpaper lying around since the 80s, and I absolutely fell in love with it. Now it's on the wall, but I'm stumped as how to make it waterproof...

How to Waterproof Wallpaper?
  Apartment Therapy

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