If you find bubbles or specks of some kind under new wallpaper, first cut an X pattern over the defect. If the problem is a speck, remove it with a tweezers or a utility knife. Then work seam adhesive into the cavity, squeeze out the excess, and seal the opening. For air bubbles you also can use a paste-injecting syringe found in paint and wallpaper departments.
When building a deck, always nail a thinner member to a thicker member. Hot-dipped zinc-coated nails are a good choice. For more holding power, consider using either ring- or spiral-shanked nails, or go with deck screws. If using screws, it’s best to pre-drill pilot holes.