Identify the seams in your wallpaper that require repair. Apply seam sealer to a small poly brush. Lift the seam slightly open and brush a thin coating of sealer onto the wall underneath the lifted wallpaper.
Press the wallpaper back into place and run over the seam with your hand to smooth it out.
Roll over the seam with a wallpaper roller to ensure that it is completely adhered to the wall.
Wipe the outside of the seam with a damp sponge to remove any excess seam sealer that may have seeped out of the seam.