Food grade silicone does exist. The question is not if it's safe, but which is safe.
I would recommend motor silicone, since it's often rated for 300 C. The surface being sealed should be scratched or sanded for better adhesion. After it has fully cured (several days), one should probably do about ten "test boils" to flush out anything that might seep into water.
Good points, thanks!
Also, make sure it is rated for the higher temperature.
i would probably replace. the fix will probably annoyingly fail. with a simpler kettle without an internal level, i suggest measuring the water you put in, so you waste neither water nor energy.
Why do you think it will fail?
shrug. homemade seal vs boiling water cycles. maybe you will get lucky.
Share some pics and make/model for more accurate advice. Off the top of my head, with no professional in knowledge, I think silicon would be fine.
https://www.wmf.com/de/en/wmf-lono-kettle-1-6-l-3200000008.html
It's hard to capture, but below the level, the plastic part (black) has a crack
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