Homebrew PCBs

It is my understanding you tin plate the pcb after etching to 
protect the new copper trace from corrosion. TINNIT is the name of 
the material used to tin plate.

--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@...> wrote:
>
> On Mon, 27 Mar 2006 17:50:06 +0200, matt clement 
<buckeyes1997@...>  
> wrote:
> 
> > I saw a process used by a fab house and they used a negative 
photo
> >
> > resist and then tin coated the board.  The tin only stuck to the
> >
> > places that had the bare copper.  Then the board was chemically 
etched
> >
> > and the tin protects the copper.  Would we possibly be able to 
come up
> >
> > with a similar system of printing a negative image and then tin
> >
> > plating before etching?  The toner would probably melt when you 
tried
> >
> > to tin the board with an iron, but maybe a chemical plating 
process?
> >
> >
> > Does anyone know for sure if tin etches away with FeCl?  I might 
have
> >
> > to try it at lunch...haha.
> >
> >
> > matt
> >
> 
> 
> I'm not sure about FeCl, those tin resist baths are usually 
Sulphuric acid  
> / peroxyde i think.
> You could do things that way, but why do you want to?
> 
> ST
>