https://www.chemtronics.com/pcb-repair-prototyping

CircuitWorks® Conductive Pens make instant highly conductive silver traces on circuit boards and are used in prototype, rework, and repair of circuit boards by linking components, repairing defective traces, making smooth jumpers. The silver traces of the circuit pen dry in minutes and have excellent adhesion to most electronic materials. Engineers, repair technicians, and manufacturers will find that the CircuitWorks® Conductive Circuit Pen speeds project completion and cuts rework time.

Transcript of video:
Let’s talk about how you can use CircuitWorks PCB Repair Pens to quickly and effectively fix broken traces on a circuit board.
The traditional method is to solder a wire jumper, which is time consuming, looks bad, and adds more potential points-of-failure to the design.
Let’s go through a faster, easier way to repair a broken trace…
First you scrape away enough resist to expose conductive areas on each side of the break.
If the board is covered with conformal coating, you may need to strip the problem area with the CircuitWorks conformal coating pen.
Next, prep the area with a cleaning pen, like one of our CircuitWorks Flux Remover pens. 
Next, apply conductive ink between the breaks in the trace. 
Chemtronics offers a wide variety of conductive pens. Our most popular pens have highly conductive silver ink, and are available with either a standard pen tip, or the micro tip for finer traces.
The CircuitWorks Flex Conductive Pen can be used to repair flexible circuit boards without worrying about the silver ink cracking and flaking off.
The Nickel Conductive Pen allows you to make high quality repairs at a lower cost, compared to silver ink.
CircuitWorks Conductive Paint comes with applicators that are ideal for very fine repairs.
Once the conductive ink has fully cured, which takes about an hour, use a CircuitWorks Overcoat pen to patch the resist over the repaired trace.
CircuitWorks Overcoat pens come in clear, green, and blue to match the original solder resist as closely as possible.
Contact us to get more information on how CircuitWorks pens can improve your board repair process.

https://www.chemtronics.com​
Chemtronics is the leading manufacturer of superior performing specialty products used in electronics, electrical systems, medical equipment, avionics, and telecom service, repair, prototype and manufacturing.  Product offerings include dusters, flux removers, precision cleaners, contact cleaners, swabs, wipers, desoldering wick, and conformal coatings. For more information on Chemtronics products, technical questions and sales support, contact Chemtronics® Technical Hotline at 1-800-TECH-401.