Here we are... bike is running (thanks Alan, you did a great job

) so now is the time to fix the leaks
The previous owner told me I would have to change the seal between the engine and the LH side cover (ignition cover??). Some people told me I don't have to use a seal there, something like "silycon paste" would do the job...
So my question is what's the exact name of what I looking for and where can I find some (online would be great...

).
Cheers
Tonio