A: Hi Priscilla. The Willowberry Removable Wallpaper. We recommend to check our product guide regarding: How to Hang Wallpaper. Here is the link: https://www.thecompanystore.com/how-to-hang-wallpaper.html The guide states in part: Repair Walls: Give your walls a thorough inspection, patch any holes, cracks, or uneven surfaces, and sand smooth. If you're installing over old wallpaper thats peeling, bubbling, or damaged, you'll need to remove the old paper and fix any wall damage before proceeding. Clean the Surface: Using a damp sponge or cloth, wipe down the walls to remove dust, cobwebs, or any residue that might prevent the wallpaper from adhering properly. Let the walls dry completely before proceeding. Apply Primer, If Required: A coat of primer can help create a smooth, even surface for your wallpaper. Always check wallpaper manufacturer requirements to see if you need to prime the walls first, and use a primer specifically designed for your wallpaper type. Thank you for your inquiry.