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we put nail polish on it, right after the kickstarter back then...but seems like we should gently redo it...On my 2nd bangle I did try to protect it in the beginning, but since it would still go over time through the protection I gave up at some point...(never would have thought it ends up like this...I thought it gets a bit green but would not go a lot deeper ;) )
I'm not sure how well the casing/pins will response to attempts to clean up the old polish first with polish cleaner stuff...do you have experience regarding this plastic and such cleaners? It was a non-aceton-clear-polish I think, so the newer, 'healthier' stuff ;)
Otherwise I don't think simply a new layer of nail polish on the old partial cleaned polish will help a lot, hm?
Unostot
Wow, that is surprising. I imagine there's a via in there that actually makes the connection to the far side of the PCB. I guess that could have gone all the way though, but it's got to be maybe 0.8mm of copper that would have to have corroded away.
Please can you try and clean hers and then cover up that particular pin with a sticker or maybe a small dot of nail varnish? Just something to stop the corrosion - it's why we ship them with the sticker on the back.