How can I preserve this old wallpaper on this crate ?

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It is brittle and coming loose at edges. I tried brushing some glue under edges, but it breaks off. If I would varnish over all of it, would the varnish soak in enough to seal it down to the wood underneath? It is so neat, I would like to save it rather than remove it. But I don't want to damage it by experimenting willy nilly. Suggestions from anyone who has done similar?

q how can i preserve this old wallpaper on this crate
q how can i preserve this old wallpaper on this crate
  19 answers