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How to use Liquidwire (conductive paint)
(imgur.com)
For questions about component-level electronic circuits, tools and equipment.
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Unfortunately the shipping fees would kill me since I'm in Europe, I really wish I could buy a new membrane but it seems like I need to do the repair myself.
Would copper tape suffice as a low resistance trace?
Worth trying. It's already broken, you can't really make it much worse. It'd probably work, and worst case you're back where you started & paying for expensive shipping.