Carefully open the book cover on one side without moving the book block. Now apply glue to the endpaper and spread the glue over the entire surface of the endpaper. You can place a larger piece of scrap paper under the first endpaper sheet of the book block so that you can freely spread glue. But this is not a must if you work carefully. Make sure that the entire endpaper sheet is covered with glue. If you used a scrap paper, carefully pull it out again. If the corners of the endpapers curl up, you can bend them back using your fingers. Make sure that you do not have any glue on your fingers before continuing.
Again check the spacing of the book against the case. Is the spacing correct and does the book block lie directly against the spine? Then carefully close the book cover on the glue-covered endpaper. Turn around the whole construction and do the same for the other side. After both endpapers are glued on, you can open the book to the endpaper page and use your bonefolder to rub the endpaper against the cardboard of the book case and eliminate any bubbles or wrinkles.
Once you have applied pressure to the endpaper and improved the adhesion, you can form the joint with your bonefolder. To do this, close the book and apply pressure to the spacing between the gap between the front/back board and the spine board. Shaping the joint gives the book a special aesthetic and supports the hinge effect.
You should now press your book overnight by covering it with heavy books or other heavy objects. Have fun with your new notebook!
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