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Sure I would just spray it on there. It is , as you would expect, a transparent finish. I don't know about filling depressions. It will go into them but I don't think it will fill them in the way...

FWIW, I've used a Krylon product called "Preserve It !" for protecting labels on eschers. It is made for archival documents and supposedly won't yellow or harm the document in any way. It makes it...