Been rocking a TLE II Kimber down here in hot and humid Houston for years and never seen rust.
Blue Wonder Armadillo is your friend. Coat the barrel and you'll never see rust.
I was told that the early XDs also had slide rusting problems but again...Blue Wonder Armadillo and in 10 years I have never seen any rust.
If metals is going to rust....it WILL do it here....still no rust on the Kimber or XD.
Buy a Kimber and use this: