Are there any Tectyl believers in here?
Yes. fisholene first to soak in, then sealed with Tecyle, Worth make a similar wax.
This might sound weird but I've found 'Penetrol' successful in stopping rust in the bottom of doors etc. Lower viscosity than water, so should go places water can't. Similar to Fish Oil....without the smell. (Also available from bunnings in a spray can to get in hard to reach places...)