MG Chemicals842AR-P Silver Conductive Pen, 8.6g

I've been using these to repair the plastic membrane sheets of my IBM and Unicomp Model M mechanical keyboards for several years and have gone through at least three so far. The silver pens are expensive, but I read somewhere that it's best to keep using the same metals throughout, so I buy those.They're not the most intuitive to use, so you should make sure to try it out on a piece of scrap paper or something you're not afraid to ruin to get the hang of it. Always make sure to give it a good shake first (like a paint marker) and squeeze the body while laying the ink down. And if you mess up, even after it dries, it's easy to scrape away with something like a screwdriver or an exacto knife, at least on smooth plastic.My picture is of some traces I repaired on a Model M membrane. I accidentally scraped them off while cleaning away a nasty stain and fixed it using this pen.

Works good, used to fix a trace on the pcb in my car’s cruise control stick. Only gripe is that you can’t really control how much comes out very well.Also note: whatever you’re doing / fixing won’t work until the ink has completely dried. Found out after 30 mins of pure worrying that I’ve wrecked the pcb I was working on.

Just doesn't work, hard to apply, maybe I've got a dodgy pen but I've tried many times to achieve continuity with this stuff without success, it's not cheap so I'm not happy with it at all!

How can I not return an item that simply doesn't work. That is completely beyond me. I spent almost $50 for a defective item that now cannot be returned or I don't get a refund for??? Wow! Just wow! I think I need to reconsider buying here.Ok. To the pen: I followed the instructions. The ink doesn't flow out. End of story.Zero stars if that was possible for the pen.And minus 5 stars for Amazon customer care.

I had an Industrial HMI (Red Lion G303) with a row of keys that were not responding, so instead of junking it, I disassembled it and found corroded traces on one of the PCB plastic sheets. I cleaned off the corroded traces and drew on a replacement silver trace and it fixed it!Note that I initially tried to do this with the cheaper carbon pen, but this didn't work. So I then bought the silver pen, which worked. So in all, I paid $40 (2022 prices) for 2 pens, and really only used them to draw a few inches. Still worth it, because the HMI itself is worth several hundred dollars, and at the time were backordered from covid supply chain issues.