Homebrew PCBs

I have very good luck with elctroless tin.  The formula I use came from the September 1971 issue of Ham Radio magazine.  

                   .5g Stannous Chloride
                    2.0g Thiourea
                    3.0g Sulfamic Acid
                  100.0 mL Distilled water

The solution is ued cold, I never tired heating it.  It plates up in a few minutes and does a goog job but can't be use as a resist for further etching.  The solution does not keep and I always make up a fresh batch for each board making session.  I would usually mix up less than 100 mL depending on the size and number of boards I was doing. 

Craig  

--- In Homebrew_PCBs@yahoogroups.com, Alessio Sangalli <alesan@...> wrote:
>
> Hi, as I am perfectioning my PCB making, I reached a point where I can 
> do very good boards, but especially if I am making a bigger, double-face 
> one, with huge ground planes, tinning takes simply too much time, and if 
> I want to do it properly, I end up wasting a lot of solder wick braid to 
> remove the excess tin.
> 
> I've read past messages but I was not able to find a method that is well 
> documented and can be considered a viable solution for a hobbyst that 
> makes only few boards per month.
> 
> bye
> as
>