BUZZARD BUSHCRAFT: Look after your Ferro Rod: It's one of your most important bushcraft items, but do you know how easily they degrade in water or if kept in a damp environment? ...
This is part of the reason why I have never recommended the use of the ferocerium rod. You are better off with the right tools, flint, steel & tinderbox, & the skills that go with that method rather than the wrong tools that have nothing to teach you so that should they fail, you are left without fire.
And it is no good carrying half a dozen of them either, same applies. One bloke stored boxes of Bic lighters against a survival day. All of the ferocerium rod flints broke down & he lost the lot. Do yourself a favour, learn how to use the flint & steel & the knowledge & skills that go with this method.