Well, some claim the acetic acid given off during curing can cause corrosion and rust formation. I've never concerned myself with it specifically, but then again most of the time when I use RTV silicone I'm using it for automotive parts and I always get the sensor safe stuff. I've found the sensor safe stuff to dry a bit firmer than typical silicone sealants and because of that I feel more secure that it won't leak later. Maybe it's all unfounded, but I've never had an issue using the methods I've described here. I'll also mention that I've cut gaskets out of various kinds of paper and they always leak. The engines I've used silicone alone or silicone and paper together have never leaked out of the gaskets. Being not of any technical prowess, I probably did it wrong.

At the end of the day, do what you know works.

By the way, good to see you around, Barry!