Homebrew PCBs

hi all
thinking on a simple and cheap method for PCB prototypes.
what will happens if we get an uniform layer of "UV cured paint" over
the pcb cooper, and we will UV cure the paint through a transparency 
were the areas to be etched will be opaque and the desired tracks will
be transparent.
If the cured paint will survive to the next step (etching attack), the
rest is so obvious that I am sure I am missing some fundamentals
somewhere on the process.

pls what am I missing????

thanks in advance

juan

--- In Homebrew_PCBs@yahoogroups.com, "juanabba" <jjose@...> wrote:
>
> hi all
> thinking on a simple and cheap method for PCB prototypes.
> what will happens if we get an uniform layer of "UV cured paint" over
> the pcb cooper, and we will UV cure the paint through a transparency 
> were the areas to be etched will be opaque and the desired tracks will
> be transparent.
> If the cured paint will survive to the next step (etching attack), the
> rest is so obvious that I am sure I am missing some fundamentals
> somewhere on the process.
> 
> pls what am I missing????
> 
> thanks in advance
> 
> juan
>

In fact, that is the well-stablished dry-film or liquid photoimaginable 
negative methods. I do not know what kind of "UV cured paint" are you 
thinking, but if it is not intended for PCB use, you can bet that 
surely it do not work. There are no UV cured paints -used for other 
purposes- that can rivale the PCB UV photopolymers.
You are right that it is a simple and cheap method for PCBs 
(prototyping or high volume just like the PCB shops).

Juan Carlos.

--- In Homebrew_PCBs@yahoogroups.com, "juanabba" <jjose@...> wrote:
>
> hi all
> thinking on a simple and cheap method for PCB prototypes.
> what will happens if we get an uniform layer of "UV cured paint" over
> the pcb cooper, and we will UV cure the paint through a transparency 
> were the areas to be etched will be opaque and the desired tracks will
> be transparent.
> If the cured paint will survive to the next step (etching attack), the
> rest is so obvious that I am sure I am missing some fundamentals
> somewhere on the process.
> 
> pls what am I missing????
> 
> thanks in advance
> 
> juan
>

In fact, that is the well-stablished dry-film or liquid photoimaginable 
negative methods. I do not know what kind of "UV cured paint" are you 
thinking, but if it is not intended for PCB use, you can bet that 
surely it do not work. There are no UV cured paints -used for other 
purposes- that can rivale the PCB UV photopolymers.
You are right that it is a simple and cheap method for PCBs 
(prototyping or high volume just like the PCB shops).

Juan Carlos.