I just learned the most amazing thing!
I have heard of steaming pastels to fix them but have, up to now, sort of hung my own pictures from hingy things behind a mat and called it done. I know my framer has little sticky sort of "rests" that the paper is not really glued to, just resting on, but this post over at ceninni sounds like something I will try to perfect.
It is using rice flour paste and (I think it is one of those "don't try this at home" sort of skills that I intend to pratice on a lot of disposable pieces before going for the gold....) dampening the back of the painting laid face down on a slick surface like waxed paper. The paste is applied to the edges only so the support has ventilation behind, for those in climates where mold is a problem, and the edges will not discolor and will release with steam for conservation!
Look it over if you want, HERE
I am into cheap and traditional. This makes a lot of sense.