Any loose edges or peeling sections should be pressed flat using a wallpaper seam roller. Furthermore, many wallpapers, especially those dating back decades, contain vinyl coatings or were stained by nicotine that standard primers cannot block.
Essential TSP Cleaning for Oil Primer on Wallpaper: A Crucial First Step
Use a high-quality synthetic brush for cutting in around edges and a dense 3/8-inch nap roller for the main surface to avoid texture buildup. Use painter's tape to protect adjacent trim, windows, and outlets.
The long drying time, however, allows the primer to fully penetrate the wallpaper, locking in any stains and providing a stable foundation. An oil based formula is specifically designed to cut through this slick surface, chemically bonding to the existing material to stop moisture from seeping through and ruining your new wall color.
Essential TSP Cleaning for Oil Primer on Wallpaper
Covering this compromised surface requires a specific approach, and using an oil based primer for painting over wallpaper is often the most effective solution. The Science Behind Oil Based Adhesion Oil based primers work through a process called oxidation.
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