you need to understand the corrosion process (at least at the school level), this is not a rust converter, and it does not enter into any reaction with corrosion, by the way, the manufacturer does not promise this. The composition simply penetrates into the "pores" of the metal and displaces water from there, respectively, the corrosion process slows down or stops. If used correctly, it's not bad at all.
And on video clips, this is of course nonsense .
in the photo the edge of the threshold afteSee full review