I just trimmed it quickly to fit and burnished it down around the rivet heads. It snugged down fine, its just hard to tel in that pic. I'm thinking the same thing with polyurethane idea or some from of clearcoat.
I probably could have done a better job of matching the sticker to the shape, but i'm very satisfied with it. I may even get some Blue reflective tape for the center Chevron as that's what the original had before I clearcoat it.