Nonglare glass is widely available through frame shops in the U.S. I don't know what the market for it is in Sweden. You might want to check around and ask for it specifically. It doesn't completely eliminate glare and reflection, but diffuses it sufficiently so that it's not distracting. I've heard, only through anecdotal advisories, that acrylic and Plexiglas can store static electric charges that will attract to them any loose pigment particles from the pastel surface. I've never actually seen an example of that, and I don't really know if it would be a big problem in any event.
Cheers
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