Step 9: Apply seam tape and prepare the seam
Cut the lengths of adhesive-backed seam tape for the long edges of the patch. Remove the backing and apply the sticky face to the length of the patch seam along the top and bottom. Cut the side pieces to fit exactly between the top and bottom tape. Measure and cut the tape and apply it to the side seams so that it just touches the top and bottom tape but does not overlap at all. Using a 4-inch putty knife, cover the tape with a layer of joint compound to make the transition from the patch to the existing wall.
 Apply the joint compound across the tape to make a smooth transition from the patch to the existing wall.
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