Sub.
Don't want to ruffle any feathers here, but IMHO, RTV of any sort should NEVER be used any where near an aircraft engine!!!!!
If you've ever opened up an engine where someone has used RTV as a gasket, you'll understand why. It does a pretty nasty job of clogging the oil screen.
In the airbox situation, any RTV that separates will probably just pass on through the induction system with no harm. Personally I wouldn't use it though. Just my $0.02.