I'm impressed at my search skills, I had this same question and knew that someone must have already answered it (and I managed to find it!)!
I'm making my bf a 52 reasons you're awesome book for that stupid consumer driven holiday coming up
and decided it was a "bright" idea to modge podge all the pages. Now all my cards are sticking together. I bought one kind of sealer, and it doesn't seem to solve the problem, guess I'll just have to try one of the suggestions above.
If anyone has any ideas how to solve this problem, I'd still like to hear it. I considered putting paper or something between the pages, but the book is already super fat to begin with!