I use this notebook for a variety of media, but mostly for watercolor practice...I have found that it stands up very well to watercolor, even when I go over things many times. It curls up a bit, but no more than some of my heavier weight watercolor paper. I have never had colors bleed through except when using markers. I did put a piece of plastic between the pages when I used my alcohol markers, but it has not been necessary when using watercolor paint. I also use it for ink pen drawings on occasion and colored pencils. It is very versatile and I plan to order another soon as my current book is almost filled now.