The stuff you are looking for used to be marketed in car accessory shops for repairing rear screen heaters.
It is basically like a small bottle of nail varnish - but loaded with either silver or aluminium powder for conductivity.
You can certainly use it to fix damaged pcb tracks (remove varnish from the good area first!!) , so shorting out a couple of SM resistors should be easy. Just don't splash it around... 
Graeme