Homebrew PCBs

Thomas wrote:

> I was at a machine shop here in Jakarta several weeks ago and they do selective plating etc for Aircraft parts, they had also repaired an Engine Block in a camshaft bore using a Coloidal Copper solution (IIRC) applied with Electrolysis,
> my first thought was to use this solution to plate via holes also, but of course the hole must be conductive for this to work so maybe the conductive silver pen will have to be used first to get the process working. I dont know about the price but looking at the amount they chew through 1liter would last me a long time if it worked ok.
> http://www.brushplating.com/
> 

I would admit that getting holes conductive is probably the most 
problematic step the process, but I would say on a whole compared to all 
the other steps, it is not that big it stands out from the rest. You can 
easily have problems with any another step while you making hole walls 
conductive step is working perfectly. I've spent a good deal of time on 
getting steps of the process working, such as the electroplating and 
photoresists lamination and the least expected one, the developing step.

Adam