I recently noticed this Wire Glue product available as an alternative to soldering. What is your experience and opinion? The glue conducts electricity just as solder does.
It’s applied with a toothpick or skewer. Once applied, you have to wait overnight for it to completely bond (cure). It sounds like a slower process but you don’t get fumed with solder…
Solder is the gold standard.
Rich
I used it in one small spot on my track where the rail was arcing. (No it wasn’t a short. However, anytime a train ran over it, the spot sparked.)
I used the glue on the rail joiner and put the two track pieces and that solved the problem.
I imagine you could use it that way for track. However, for actual wire, I would say either twist it together and liquid electrical tape or use a wire nut.
Or, solder. 
Rich
There are those of us who do not use solder for one reason or another.
And that’s precisely why I introduced the subject.
I tried using Wire Glue to connect 10k ohm SMD resistors between the wheels and axles for my resistor wheelsets. I had a 100% failure rate with either an open circuit or way more resistance than it should be. I saw a YouTube video where someone was using solder to do the same, and while this worked I did have issues with heating up the plastic insulators on a few wheels and getting objectionable runout.
In short, I feel it depends upon what you are trying to do as to which is a better solution. I found another product (the name escapes me right now) on Amazon which works very well for making resistor wheelsets and would NEVER try to use solder for that purpose again. But for most other electrical connections (save for track feeders to busses which get suitcase connectors) I use solder.
That’s been my experience as well.
On the subject of resistor wheelsets, are you referring to conductive paste?
Rich
wire people at work who spent several hours day soldering had had fume extractors. not sure it’s that big a problem for model RRs
i suggest that “Wire Glue” is yet another tool in the box for making connections including suitcase connectors and other crimp connectos, wagos, terminal strips, wire nuts, … that may all be useful in various situations
a video posted on MRH highlighted that crimp connections are required in high vibration environments such as air and military applications. model RR is typically not a high vibration environment (with the exception of transporting modular units)
IMO, most people will be very sorry they tried it. Wire glue has fairly high resistance and poor structural strength.
While it might work for some low voltage and low current applications, for most applications it will be substandard. Why ask for trouble when soldering is so easy to do?
Yes. it is poor structural strength that would concern me
Rich
Yes, it is a conductive paint.
From what I can tell this is similar in principle to the ‘nickel print’ that I used for many years to repair printed-circuit traces and the like. That contained irregular flakes of nickel which touched through the acrylic adhesive to produce many small near-point contacts in a matrix of hardened adhesive.
I read one report of a user who mixed Wire Glue up with some amount of clear Gorilla Glue for extra bond strength. Against all odds he reported ‘good conduction’ from the result!
I concur with others that ‘success’ with this product is going to involve a good, conductive mechanical connection wire-to-wire, with the glue being applied only to secure the joint.
I find it interesting to see the lengths people will go to avoid using a simple tried-n-true solution for properly handling of electrical connections. 
Ya think? Honestly, it never crossed my mind to use method but soldering.
Rich
Being a double E, I normally think of soldering for electrical connections, but can see why “WIRE GLUE” could be the preferred choice. There situations where one would not want the high temperatures involved with soldering.
As for crimp connections in aircraft wiring (got a thorough introduction on a couple of projects), soldering would create a hard spot where stress concentrations can work all their evil magic.
Well, being a EE myself, and having had a career designing avionics for commercial and military aircraft, I never heard anyone ever even mention wire glue. Yes, most of the wiring harness connections are crimped, but that’s not glue! I maintain my opinion, wire glue has no place anywhere near my trains or any other electronics.
From what I gather, wire glue is similar to conductive ink, which does have its uses in electronics. I wouldn’t use it for applications that required any significant amount of current, but using it to attach a capacitor across an insulated wheelset sounds appropriate to me.
3D printed circuit boards also use something that sounds similar to “wire glue” to form the conductive traces.
When I look at a typical process for home printing of PCB’s, I simply say… NO THANKS! 
This process appears to only be suitable for very crude circuit boards.
Here’s a typical board that I would create, I can’t imagine being able to do this with my 3D printer and getting a usable result.
Some of us are just really bad at soldering and never seem to get it right.
