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Sonax as much as i know is based on acid thioglycolic , its little different from our tech, IronX attack stronger iron dust , the color change means reaction with irons and metals but how deep or strong it react is the question.You already are de-ironing the wheels with Sonax FE. That's the whole point of the color changing product. No need for the IronX, unless you want to waste product.
there is no poblem with the rotor discs, water wash the melting dust away. its also safe on the calipers , most of them, just dont spray on hot surface and dont leave it hours to dry on them.. HTHI always thought using Iron X on wheels wouldn't be a good idea just because you don't want it to get on the rotors? Guess you just gotta be careful.