I don't know what coating they use, but I'd email them if you're worried. I know some guys are doing clear vinyl on the shocks.
The other parts, the few guys I can think of with carli setups aren't in areas that I'd associate with being salty. Matt @ CED has a carli and I think he's might be in a heavily salted area?
Honestly though, I wouldn't worry that much, they seem to be a higher quality product, so if their chit rusts in 3 years, I'd imagine that you would've been screwed with any of the other kits out there. Seems like most guys here use icon, but there's a pretty nice following on the org for carli stuff.
Not saying that you should go to the org…but the "Carli Suspension" section may be of use/interest to you.
Sent from my iPhone using Tapatalk