Amazing product! It is easy to work with and adjust if you make a mistake while fixing the book spine but also has great staying power. I was determined to fix our book spines and have a few air bubbles as possible and it was extremely easy with this product. Our son loves books and has a pretty impressive little library but a few books required some tlc. The Dino ABC book needed a ton of help. The front cover was completely detached and with this product its almost as good as new. Now that our toddler is a bit older we’re teaching him to be more careful with books so hopefully we won’t need such extensive repairs in the future. :-)I am particularly sentimental about the If Animals Kissed Goodnight book, it’s the first book I ever read to our son the day he came home from the hospital and we read it every night for bedtime. He’s 22-months old now so this book has been through a lot – teething, enthusiastic page turning, you name it! He has favorite parts in the book and sometimes he will bring it to me and turn to the pages he likes for me to read those parts to him. All this to say I was devastated when the spine began to fall off. As you can see in the pictures the book is no longer in such sad shape and we’ve avoided having the book fall apart on us. This product saved our favorite book!