I saw how clean and neat the books from my uni's library are. I thought I wanted my books to be as clean. I purchased this without knowing how to use it (well, I know the general idea, but not the technical details).
I wasted half of the roll for the trial-and-error 😂😂 If I wasn't gentle enough, I would ended up destroying my books because it sticked strongly to everywhere!
Finally, I figured out how. Now my favourite book is protected perfectly!