Why is the spine of my book not glued? allenrbird September 20, 2018 04:37 We intentionally apply less glue and tape at the spine area. This allows the photobook to open, close, and stretch without ripping apart. So therefore, this is NOT a defect, but a mandatory part of our book's design that serves a critical function. Related articles What does your end paper and fly sheet consist of? Why are the pages of my Layflat Photo Book not laying flat? What is the difference in Standard and Thick paper in Flush Mount Albums? What is the difference between the Layflat Photo Book and the Flush Mount Album? Do you print nude or boudoir photobooks?