If it's cracked all the way through the paint and the cracks are visible on the back side, I *might* try a few drops of loctite liquid super glue if it looks like things are loose. Otherwise, I'd leave it alone.
I would certainly not seal it or use tape. That's for only when the backglass is seriously deteriorating.
Some spider cracking in the paint is normal due to the age of the backglass.
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