Anyone ever heard of using #00 silk thread as an 'o-ring' on the case seal? It's laid into the sealant in a single thread all the way around the perimeter of the case. Apparently this is done in aircraft (Lycoming?) applications.
Alternatively I was considering milling a CNC slot and using a real strip of O-ring.
I really hate a dripping case on a nice car.
I think I need more sleep.