When two drops of paper have not been butted together closely enough, you may find a narrow white seam showing. Make sure you soak the paper for the correct time or it could shrink as the paste dries. Sometimes heavier and darker wallpapers are manufactured with a white edge, and the makers provide special colour-matched pens for you to obliterate the white. Seams that don't stick are nearly always caused by not lining the walls before hanging paper. Carefully lift back the seam and apply a little strong adhesive with an artists' brush then roll the paper back into place with a seam roller and wipe the seams to remove excess adhesive. If the paper has a raised pattern, don't press too hard on to it or you'll squash the pattern. Seams should butt up against each other, not overlap. If they do, you might find the seams don't stick, so treat these as you would for lifting seams.
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