Do you like to throw things? I don’t like it but I need it so I execute to keep a clean house.
Adding guesso coating (this is what you put before paint) on pages of some books I like allows me to keep the book and be fully happy of that. Once the coating is done, I have a brand new sketch book ready to use without being too ‘precious’ or ashamed to waste a blank page and allow me to just try, be crazy and see what is happening (did you ever had a Moleskine that you keep blank because the notebook is just too beautiful? I never do that with my old ready-to-paint books!).
You can check my whole post here : www.louect.com/creative-ideas/painting/dont-throw-your-old-books