I hack everything that comes into my hand since I was a kid and the fever is not about to relapse
and rare !!
Otherwise I notice that there is colloidal graphite that can be deposited by ink jet (with large droplets) which, once dry, is a good conductor and can serve as a support for electrolytic deposition of thick copper!
But silver remains much better conductor and much easier and stable deposits of copper are chemically difficult with copper sulphate.
With oxalic acid, a precipitate of blue copper oxalate is obtained which decomposes at high temperature (red) into lightly oxidized copper, but the epoxy will not resist the necessary temperature.
http://books.google.fr/books?id=DcxbAAA ... &q&f=false
Finally, in personal DIY at home, we often only need a single copy of the circuit, and then it is completely useless to make a printed circuit, it is enough to wire it with simple wires and soldering, sufficient for a single copy to develop sometimes in addition !!!!
Thus, I no longer need a printed circuit for a single copy, as for an alarm that has worked for 10 years !!