This is mostly with homebrew conductive nail polish. Pen had overall worse properties but made a good foundation for polish to grab.
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Recipe: 15mL OPI start to finish (half-emptied mini bottle) + full 0.3g tube of lock-lubricant graphite powder from Lowes.
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Pretty sure the mechanism for how this works has something fun to do with percolation theory.
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Saw this just now, but I found that copper tape works great to repair keyboard matrices -- and they last longer than conductive paint. Maybe something to try next time you need to repair a keyboard :)
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In the writeups I'd read, ppl found copper tape harder to use, esp. getting conductivity across the adhesive. Also my existing traces were threatening to peel further, & the polish stopped that.
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Once it's put back together, there shouldn't be significant mechanical strain on any of these - they're all outside the key zone and mostly outside the metal and plastic outer layers (that's how they got ruined).
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