During the Berlin Airlift 1948/49 the British contributed their Short Sunderland flying boats operating from Elbe in Hamburg to Havel river in Berlin to transport goods into the soviet blockaded West Berlin. Especially salt as the RN aircraft were protected against seawater and could better withstand salt as cargo.
What did they do to protect them? Is this just WD-40 like some greasy oil cover you put on any metallic surface?
Sunderland unloading salt at Berlin:
http://www.flying-tigers.co.uk/wp-co...lift-1948-.jpg