So there's this spray out there called fixative/fixer that you spray on your chalky mediums that might smudge. Now this spray is pretty decent...but it is very very expensive! Why spend all that money though when you can use the very cheap HAIRSPRAY alternative?!

It does the same thing and most of them smell 100 times better! Test them out until you find the right one, some can darken the paper. My art teacher found that the cheaper brands worked better, and when I switched to a cheaper brand as opposed to the one trumping "mist" technology I found it worked much better too! There's a bit of an extended drying period, however.