I think the main difference may be since FL is a paste it resists salt water soaked paper towels better since it is actually a thick pasty barrier.
When it comes to what is best for a salt water mist or humidity fireclean works better because if you happen to miss any of the parts it will spread to those parts, unlike FL that just never moves unless you want to oven bake your rifle.
Thats my experiences living in a high humidity, high salt water area. What is most interesting to me, is that unlike other liquid lubricants fireclean stays put in areas where things contact each other, so even after a week of sitting my rifle and handguns are still suffeciently wet on places like the carrier rails, cam pin, and gas rings. On my beretta the rails and locking block are still wet as well.
Other liquid lubes would have moved out of the rifle fully by now, including slip2000 EWL.
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