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user-inactivated · 3448 days ago · link · · parent · post: School Scrambles To Preserve Newly Discovered Chalkboards From 1917 : NPR
Maybe they could spray on some gentle coating or something? I think there are artists that work in chalk that do something like that.
There are multiple fixatives artists use to prevent smudging pastels and charcoal. We use hair spray at the frame shop I work at but I question its archival nature. I don't get why this is a problem unless the slate is resistant to fixatives. Hell, take it off the wall and frame it under glass.