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A superior finish for lining is achieved by using caulk or flexible filler along all trimmed paper seams. Caulk is applied using a sealant dispenser, and must be smoothed immediately.
Apply caulk evenly, creating a uniform bead along junctions (Image 1).
Smooth with a wet finger to remove ridges and surface imperfections (Image 2).
Use a damp sponge to smooth caulk (Image 3). Rinse regularly.
Imperfect seams on a lined surface may be improved by using some all-purpose decorating filler. Some manufacturers make ready-mixed “fine-surface filler,” which is ideal for use here.
Apply filler using a filling knife (Image 1).
Let the filler dry, then use a sanding block to smooth any ridges (Image 2).
Make sure the filler is "sized" before any wallpaper is hung (Image 3).
For a perfect finish, seams can be disguised in a wallpaper finish by painting the background a color similar to the paper "base" color.
Mark a line on the wall where the papers will meet. Paint over the line with the appropriate paint (Image 1).
Allow the paint to dry. Then hang the first sheet of paper and smooth down with a brush (Image 2).
Hang the second sheet next to the first. If there is space between the two sheets, the paint will disguise the gap (Image 3).
Excerpted from Do It Yourself Home Improvement
© Dorling Kindersley Limited 2009