Step 7: Cover Back On
After the glue has hardened, apply more glue to the remaining back of the spine so that you can glue the cover back on. I was going to use the white material to reinforce the hinges but didn't feel it was necessary on this book. You can choose depending on what kind of book you use.
If you want a more finished appearance you can paint the interior or glue felt to the inside to cover up the glued edges.