All you need is a wafer thin smear. This isn't a SBC china wall..... just lightly with your finger.... just the tip and only for a minute.
Yep, just a thin smear. If the broken bolt is on the side with the o-ring there's little chance it will leak as long as the o-ring is new OE and properly seated.
The Ultra black has a stronger resistance to engine oil, and seems to have just as strong or maybe stronger bond as ultra grey.
Since I ran into an issue with the new water pump I installed being faulty, I'm going to kill some time by taking off the oil pump again and redoing the seal. But here's my big question-
How on earth am I supposed to get the oil pump free from the grip of the ultra black? It's putting up a very impressive fight