Is there any way to laminate the back of a guitar?

I recently got my Steinberger Spirit signed by the Black Veil Brides. But this guitar is the only electric I own, and it's also now my absolute favorite, for obvious reasons. I have big plans for this guitar, including new pickups and a new combo headpiece, and I would like to keep playing it well into the future. But the guitar was signed on the back side, and I'm afraid that with frequent contact with my body, the signatures will start to wear away and perhaps disappear completely. Is there any cheap, simple, and permanent way to laminate or seal the back of a guitar so I can ensure that the signatures never wear away?