Nothing is totally rust proof. I have a stainless synthetic Rem 700 mountain rifle, and one long day in sopping wet rain forest hunting on the wet coast will produce a trace of rust on the bolt. It is guaranteed to rust a bit if you leave it overnight after such a day. Even smaller trace of rust on barrel and trigger guard.
Don't know how the titaniums fare.
Stainless helps a lot, but you still need to wipe, oil, silicone, etc. I can get away with a three day hunt without any care unless it is really sloppy wet, equivalent to submerging the rifle for hours. Away from the coast I go from Sept. to January without a thought of rust on the stainless.
