MG Chemicals 838AR-P Total Ground Carbon Conductive Pen, 4g , Carbon Black

Does work but as others have said, it's a white to administer due to stupid ball heading tip.Only works on a flat surface you won't get it on soldiering joints for fixing circuit boards only

expected this to be conductive like the description said. But it's not. It has resistance. So not suitable for what I needed, repairing broken circuit traces. This is similar to the carbon in a solution products you can buy at car shops. Not recommended. But it does dry quick.

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.

This stuff is great but it takes a lot longer than you think for it to cure, in my experience it takes about 3 days to work properly. The trace width is a little hard to control as you can see from the picture, but despite appearances this did repair the membrane contacts on the electric piano I was working on and saved £60+ on getting a new board and sending this one to landfill.

I had a few remote controls where most of the keys stopped working due to the carbon wearing off the membrane pads and not making sufficient contact with the PCB. Putting a blob of this carbon compound on the carbon pads of the membrane fixed the problem entirely. A few tips;- wear gloves, this stuff is messy and carcinogenic- shake the pen for 30s- use a sheet of paper to clean the nib- make sure the surface is clean, IPA+cotton bud- leave for 24 hours for conductivity and strength

First one turned up dried out, Amazon replacement was prompt and the paint works fine. It's very quick to dry and the nib is quite wide so it's tricky to do smaller contact points like PS3 ribbon pads. Masking will be required.

I had no idea this sort of product existed but I'm so glad it does. I recently decided to dig out my old Commodore Amiga A500 and noticed a line of keys wasn't working (F2, 3, E, D, C). A bit of online searching and 'YouTubing' suggested corrosion on the keyboard membrane and, more importantly, how to fix it with a product like this. Thankfully, I discovered I only had a tiny bit of corrosion along one of the lines shared by these keys, and it was literally a simple matter of scratching out the corrosion and 'dabbing' over with this pen to reconnect the line. I am a complete novice at hardware repairs so I was thrilled that it worked and my Amiga is as good as new. I will just say that the pen behaves like an ink gel pen and the carbon can be a bit 'blobby' when it comes out, so be aware if using on small crowded circuits. But it's a great, simple-to-use product that has already paid for itself. Oh, and much Kudos to the seller for getting it to me so quickly...you made my day.

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!