Helmar Professional Acid Free Glue has been specifically designed for book binding, mounting photographs, preserving old and precious books, documents, scrap books, etc.
Featuring excellent adhesion to dense papers with highly flexible bond. Sets clear, dries quickly and will not yellow with age.
Non wrinkling. Neutral pH level.
I have been repairing some book spines, for which acid-free glue was recommended. (I did a google search to find it in NZ, and your product was what I found.) It seems to do the trick.