> A friend was telling me about a chemical he painted on copper clad to
> make photosensitive PCB's, rather then buying the presensitized PCB.
>  Anyone know where you can buy this?  In Canada preferably.

I did that sort of thing a bit over 20 years ago.  At that time there were
two basic types.  One was a lacquer-based spray that had to be developed in
a special chemical that appeared to be lacquer thinner with stuff added.
The other were two water soluable chemicals that you mix shortly before use
and paint on the board.  You let them dry, expose, then rinse in water to
get rid of the unexposed areas.  You have to then bake the remaining part
before it works like a resist.  I played around with both methods and
decided I liked the second better.  It was called something like "Resolve"
if I remember right.  I found it in a local electronics store.

I have no idea how things may have changed in the last 22 years.


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