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Common mistakes when finishing basement walls include neglecting proper insulation, insufficient moisture management, and poor ventilation. Not addressing these issues can lead to mold growth, water damage, and discomfort. Additionally, inadequate planning, improper framing, and rushing the project can result in subpar outcomes. 

It's essential to follow best practices, seek professional guidance if needed, and prioritize thoroughness and attention to detail.

How long peel-and-stick wallpaper lasts depends on a few factors, including the conditions in the room, the quality of the wallpaper, and the wallpaper's application. As a general rule, peel-and-stick wallpaper can last for at least five years, but you may decide to remove it sooner. Under ideal conditions, it can also last for much longer.

Factors that may shorten the lifespan of peel-and-stick wallpaper include high humidity in a room (such as a bathroom), dirty walls, and low-quality paper.

You may end up with extra wallpaper once your project is finished. Hang on to that wallpaper, as you may need to use it to patch up areas that get damaged later on. If you have a lot of excess wallpaper, try getting creative with it. You can use it to line the inside of a cabinet or drawers, for example.

Painting over wallpaper is an efficient way to cover it if it’s in decent shape. Before painting over wallpaper, make sure the surface is clean and smooth. You may have to remove minor problem areas, such as lifted seams or small peels, with a sheetrock knife or putty knife. Add a latex- or oil-based primer to keep moisture at bay before painting. You’ll likely need two coats of paint to cover the area.