You do make I larf antoine
Before they take the p*ss some more, the stuff is called silicon rubber 'instant gasket'.
Not so many places sell it now (I've had trouble getting it from halfords) but most motorbike shops sell it.
There is a similar-looking kind of gasket compound that is non-setting that you dont want to get if you've never used instant gasket before.
I quite like the orange stuff myself, as I can see where I've been then
