Homebrew PCBs

well then,

i just checked my chemical supplier has tin sulfate in his stock list.
also sulphuric acid would be no problem at all.

BUT i have not the slightest idea where to get the additives.

I read this stuff always concentrates at the point of highest potential, 
preventing plating at this particular point, So you get a even coat
as the additives move around all the time.

just BAD that it isn't something simple.




st