Adam is correct. Today's chemistry is pretty sophisticated.
Buy the boards pre-coated, or use the sprray from a can. If you really want,
you can get film that you can lamnate yourself.
I do remember there was a Chromate / gelatin mixture used many years ago.
You may still find references to it under screenprinting.
Myc
On Tue, Jul 1, 2008 at 6:25 PM, Adam Seychell <
a_seychell@...>
wrote:
> palplr wrote:
> > Can any one say what are the easily avaliable photo checmicals to
> > spray or paint on the bare pcb for either positive or negative print.
> >
> I don't think you can easily formulate our own liquid photoresists that
> perform as today's commercial photoresists. Exact ingredients and
> manufacture process would be a trade secret, and to get close you have
> to be expert in that field of chemistry. Because you ask the question I
> assume you have very limited knowledge of chemistry just as I do. Your
> best bet is to study chemistry and search the patent databases.
>
> Good luck,
>
> Adam
>
>
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