Thanks everyone for the advice. So far what I've been doing is just using a load of fixative. I lay one layer down, let dry, then another. Rinse and repeat x5. Still some pastel coming off.
I'm using Mount Vision pastels, and they seem to darken more on paper then they do on ceramic tiles.
The image below was my first attempt. Very experimental, but I have improved my technique since then. I'll post more images later in the proper forum. The texture does not show well except around the eye. It looks amazing in person. Should have used a flash.
Going to search out that thread. I'm thinking maybe an epoxy coat over a fixed layer might work. Will post my results!
Edit: I managed to find this: http://www.skjackoboice.com/images/a..._june_2004.pdf
with a forum search. It somewhat details a technique used to seal pastel on canvas. Seems like this just might be what I'm looking for. Posting it here for future reference.