Radio cleaning and pre-emptive cap. repair?

I removed the top cover of the radio to do some light cleaning. So far just lightly brushing the dirt and vacuuming it up. And maybe that will be it.
There looks to be a hairline crack on the 50 microF capacitor.
Any idea what that is made of?
I'd like to weld or epoxy that up - assuming its just plastic aging and not a sign of internal failure.
Not seeing any leaking or bulging.
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Model 236
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