Has anyone yet mentioned that not all cotton balls are "cotton", some are poly fluff and will not catch a spark worth a damn I 'm told.
Very true. Nes sure the cotton balls are actually cotton.
Someone said that ferro rods, or commonly called firesteels are waterproof. That is true but if around saltwater for very long they erode to nothing. Most will erode to dust in a week or so, if the protective coating has been scraped. Even in a pocket around saltwater, like in sea kayaking, they will erode.