Thanks for the info.
I must admit, I'd be scared that some of that RTV would blob up enough to become a piece that ultimately falls off (I once had something similar happen in an auto cooling system; the piece of silicone ended up getting stuck in the thermostat, holding it open). But it is surely an effective method of keeping any PCV oil out of the intakes. And a small - very small - piece of silicone would probably ultimately make it out the exhaust without damaging anything.
If you ever pull it off again, let us know if it looks like the silicone 'rings' look to have survived without losing any material.