I would be furious as well, I have just found out the hard way about fixatives and pastels. The painting I did of the couple, posted in the new member intros, doesn't look remotely like that anymore. I was taking it to be framed and sprayed it before I left the house. I didn't really take much notice but when I took it out of the folder at the framers, did I get a shock. They both look as though they have spent far too long under the sun lamp!!
Also, all the white highlights had disappeared.
Can it be fixed?