Can I use Rusoleum Mirror Effect to repair a blackened mirror?
Can I Use Rustoleum Mirror Effect to replace a small portion of my bathroom mirror that is now black
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You can try and see if you like how it looks. Read these to see if they help prevent further damage.
http://www.howtocleanstuff.net/how-to-clean-black-spots-on-mirrors/
https://www.framemymirror.com/black-edges-on-mirrors-why-it-happens-and-what-to-do/
You could check out some of these fixes to see if one may work for you. https://www.hunker.com/12002132/how-to-repair-a-scratch-in-reflective-coating-on-a-mirror
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