We love books, and since we homeschool we have lots of books, and since we use Sonlight we have TONS of books!
A long, long time ago I grew frustrated with finding precious books destroyed by precocious preschoolers. I tried putting them back together with Scotch tape and packing tape, but what was really needed was a way to protect them from damage in the first place.
A light bulb moment resulted in covering books in Clear Contact Paper. Books that are almost 10 years old, still look great. The insides wear out before the cover. I can even put a drink on the cover and it does no damage. (This is starting to sound like an infomercial!)
Since this can take some practice to perfect, Emelie videoed me covering one of our books that had already sustained some damage before I got a hold of it. We were cracking each other up, so please disregard the giggling.
Give the Contact Paper a shot! It's a great way to protect your investment.