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'll show - have a protective lacquer bed cover? Or rather hide under the glass?
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Now there are a large number of professional fixatives for pastels. There are very good.
Some artists use hairspray.
Any material that you will cover the work done by soft-pastel, kill and velvety softness inherent in this material only, ie pastels.
If this figure (not painting), executed in pastel, charcoal, sanguine, sauce and even a pencil, it can be slightly pripylit. But in any case not pour a thick layer of shiny. Spoil and work, and paper (cardboard), on which work is done.
Good luck.
[color="# 666686"]Added after 2 minutes[/color]
Continuing. Glass, after all, it is better to postpone the work. To avoid contact. This applies not only to pastels, but also to all techniques.