Homebrew PCBs

In a message dated 4/4/2007 6:58:22 P.M. Central Daylight Time,  
a8723@... writes:

I am  wondering what people use to coat the copper traces to prevent 
corrosion.  <<
Tin or "solder-" plating, like professionally done boards will  make the 
traces remain brighter much longer than bare copper.  Kepro, and I  assume other 
vendors, sell a "Tinnit" stuff that, in a heated solution, will  
electrolessly-plate a board that has resist already on it, exposed, with pattern  showing.  
This is to make a Tin-Resist on the copper.  Then, you can  heat the etched 
board to "reflow" this tin plating.  This also makes a PCB  much easier to 
solder!
 
The green solder-mask is a kind of epoxy which, as the name  implies, is to 
keep solder ONLY where it's supposed to go, in a wave-soldering  proceedure.  
That is applied ONLY after all the "metal etching and plating"  has been done.  
NOT an important step for home-brewers who solder  skillfully, if pretty!

 



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