(http://www.partsexpress.com/images/341-236m.jpg)
The CircuitWriter Pen is a highly conductive polymer for use on a variety of applications. Draw traces on circuit boards, repair defective traces, make jumpers, shield electronics, design prototype circuits and repair rear-window heater traces.
I need what this does, except I can't find this shit anywhere in stores, and i can't get it online for any cheaper than like 20 bucks with shipping. And I don't really feel like buying it online.