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I ended up ordering CW2500 (two syringes, needs mixing) just before aprendiz replied, turns out to be similar stuff to whats inside those pens, but it can withstand a much higher temperature. Should some soldering or hot air be required after using this epoxy, I can do it without ruining my work. Tested on a donor board for both a jumper wire and two connectors. I cured it at 100 celcius for 10 mins, and its pretty solid right now. I couldn't pry the connectors off with tweezers, and thats good enough for me.
In fact, I can barely get the stuff off the board without damaging it, so its pretty solid.
I've used too much on both connectors, and some of the stuff was too close to the tape I used to secure the wire to the board. The epoxy slid underneath it, creating nasty looking spots. No harm from that though, just looks messy. I used too much on the connectors, so it crawled inside of those too, making one inoperable and the other difficult to move. Is that why you use the glue instead? I'll use less epoxy next time.