Hey, i found some spray thats recommended in a german magic shop. I try to translate it with google. here is the translation: The invisible protective film on the can for many graphic and artistic works in the studio and at home. The highly transparent, easy matting film coating will not yellow and is touch-dry. Suitable for all work in chalk, pastel, red chalk, charcoal, pencil, watercolor and tempera paints, not polystyren. ... the translation is surely not 100% correct, but can you say, if such products are OK?
Thx again...
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