I can't figure out whether you've replaced your garage lights with black light flourescent tubes or whether you park your Tundra in a "Disco"--how on this blue planet did you find this anomaly?
Furthermore, you may just have the one in a million special Wonka-Bar Tundras that will somehow make collectors vibrate their pocket protectors to pieces someday...h#!! no you shouldn't paint over it, only the most very expensive paint jobs can match the factory quality for consistency and hardness.
Incidently, if this "latent defect" is the only one you could find in your forensics-lab-of-a-garage you should be the biggest Tundra fan ever!
The glass may just be twice as big as it needs to be....
Dan'l
P.S. Can you post a picture. Most threads bore me but this is an interesting story.