How to save a vintage sticker?

Kirsten Ruiz
by Kirsten Ruiz

How can I preserve a 100 year old sticker on a glass pane. It is an old Pacific Telegraph and Telephone sticker on a door from a building that burned. The door and sticker have a great patina and I really want to save the sticker, (I retired from Pacific Bell) Will Modgy ruin the sticker?

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