No sealant is going to stop the compression forces of your piston/cylinder so it's not worth the bother.
The gasket is a press gasket. They are not designed to need sealant or be re-used.
You need to buy a new gasket and closely inspect the mating surfaces between the head and the barrel and why it may have leaked.
Most of the time, it's just a gasket fail and a clean/replacement will sort it out.
The bike may have had some work on it and the gasket was re-used and that's why it's leaking. That's why they generally leak.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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