Measure the height of the book and cut a length of tape 1 inch longer. Make sure the tape is wider than the width of the spine as it needs to overlap on both front and back by about a 1/2 inch.
Place the tape face down (sticky side up) on a flat surface, then carefully lay the closed book on the tape so that there is an overhang at both top of and bottom. If the book spine is very wide it may be easier to apply the tape directly to the spine, again keeping the overhang at top and bottom and at both sides.
Smooth any air bubbles out of a wide spine, then fold the sides of the tape over the edges of book onto the front and back covers. Smooth and press the book binding tape securely to the covers, removing any wrinkles.
Trim off the excess binding tape at the top and bottom. For hard back spines, the tape should be tucked behind the spine for a neat finish and for paperbacks or thin booklets the binding tape can be trimmed level with the edges of the pages.