Homebrew PCBs

Has anyone tried used a conductive pen such as the ITW Chemtronics
CW2200MTP for making vias conductive.  Once the via has been treated
with the pen it may be possible to solder it with a low temperature
solder.

Found this

"Curing: Tack-free in 3 to 5 minutes at room
temperature. Achieves electrical conductivity
within 30 minutes. Heat cure for 5 minutes at 250
to 300°F (120 to 150°C) for maximum conductivity,
durability and chemical resistance.

Soldering: Low temperature soldering is possible
to the heat-cured silver conductive traces if done at
350°F (177°C) for <5 seconds."

Note: Solder iron tip temperatures are most commonly between
315-371°C (600-700°F) for Sn63Pb37 and
Sn62Pb36Ag02 alloys.

It looks like we have to use a low temp solder. SnIn20Ag2.8 may work but
I have not found a source for it.





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