On 10/06/2019 21:52, Fredxx wrote:
I'm very aware 2-part RTV silicone rubber exists at various moduli, but
need something that is more oil resistant and can be moulded into a
gasket of sorts.

Any ideas?

Frankly no. I think nitrile needs fairly sophisticated kit to make -
isn't it moulded and vulcanised like tyres are made?

There are various 'liquid gaskets' products that might be worth a look

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