Before wallpapering, which material is commonly applied to seal gaps?

• A. Caulk
• B. Primer
• C. Tape
• D. Putty

Answer: (A)

Sealing gaps with a flexible sealant is essential before wallpapering to create a smooth, continuous surface and prevent air, moisture, or movement from causing the wallpaper to lift or bubble. Caulk is ideal here because it fills gaps around edges, outlets, baseboards, and seams and stays flexible as the wall shifts. Most latex caulks are paintable, so you can blend it with the wall color for a seamless finish.

Primer, while important for adhesion and sealing porous surfaces, does not fill gaps. Tape is used for masking or protecting edges, not for sealing gaps. Putty is great for small holes and nail pops, but it dries hard and can crack with wall movement, so it’s not the best choice for gaps before wallpapering.