Oil leak, right crank seal (under YICS cover) - Sealant?

I took the right-hand YICS cover off today, and oil/water/white sludge came running out.

Figures; I just got the top end rebuild nearly back together, and thought I could see the light at the end of the tunnel.

The seal on that right side is the solid black piece (no hole in the middle), and it's retained by a lip in the case. I DO NOT want to split the case right now, just for that. Is there a good sealant anyone can recommend that might hold up in that area between the case lip and the black seal?

 

Luckily there's also no pressure to speak of behind that seal.

I would flush it thoroughly clean with Brake cleaner or some other completely dry solvent; then blast it dry with compressed air and repeat, to drive out as much of the oil residue as possible.

Then I would hit it with a few drops of the original, watery Super Glue.

I successfully stopped a "seeping" oil level sight glass from weeping using that technique. Unfortunately I can't tell you how long it would have lasted as I replaced the offending clutch cover after a couple of months.