Glue the spine of stitched book blocks with lightly pigmented, transparent or coloured hotmelt.

With this method, very surprising results can be achieved! For example, by making text visible that is printed in parts on the spine of the sections, then transparent glue or lightly pigmented glue is used, or the spine of a book block can be completely coloured.
This is a very responsible way of book block stitching and has a very good result with regard to the lay flat, of course it is possible to glue the book block on page 3 of the cover or to put a dust jacket around it! (In that case, you have to sew in front of and behind a 200 grs spathe).