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My experience is only with the material I used and put a link to. If the product counter indications says not for ferrous metals, then cast iron is out of the equation. There may be a similar low temperature solder/brazing material for cast iron, but you will need to be really sure it is the right material not just for cast iron but also for the purpose you have in mind that the item is to be used in. Cast iron from what I know is notoriously difficult to repair/weld.
There are arc welding rods for cast iron, but I haven't used them either.
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