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I have very corrosive sweat, and I have those same bars. This was not sweat, I agree with your assessment that something else, like the gel, leaked onto the bars. Perhaps the combination of sweat and the gel made some sort of super-acid, it's really hard to say without knowing the composition of the gel pads.

I did corrode through a bar myself but it took 12 years and the bar only had a small hole in it, and didn't fail. I switched to carbon bars a few years ago, the only problem now is that the steel clamps for the shifters rust even more!
 
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