Homebrew PCBs

I've never tried ramping the temperature that high, since I always solder
manually. I remember seeing this paint burn (to a darkish brown color) too,
but I do not know how high the temperature was since I wasn't monitoring it.
Good luck...

On Thu, May 13, 2010 at 10:18 PM, micro_minded <iceblu3710@gmail.com> wrote:

>
>
> Have you tried ramping up the temp to 220C to see if the paint can
> withstand reflow temperatures?
>
> I have moved away from PTH design and onto SMT only and have had difficulty
> with paints, toners and reflowing. I use the pulsonix transfer setup and it
> works great but if you use toner as a soldermask or even as a component
> layer it melts/burns and can run into solder joints and ruin things.
> Hopefully this paint will stay in place and not liquefy.
>
> I'm planning on going out to grab some in a few hours and do some testing
> this weekend with fully fabbed boards and liquid tin at the end.
>
> Anyone know of a cheap way to make an airbrush? I don't have a compressor
> but I did find a $26 airbrush that might work:
>
> http://www.kmstools.com/badger-model-250-airbrush-set-73
>
>
> --- In Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>,
> Tolga Abaci <tolga.abaci@...> wrote:
> >
> > I am not sure if the paint would work in an inkjet head. It is
> water-based,
> > I guess that's good. On the other hand, it's quite thick. Maybe if it's
> > thinned enough and printed in several layers it would work. You need to
> have
> > a fairly thick layer of this paint to get it work well as a soldermask.
> >
> > For me, this method was quite attractive for two reasons: First, the
> paint
> > is cheap and available everywhere. Second, I already got the toner
> transfer
> > process working well, and this is quite compatible with it, it was a mere
> > extension.
> >
> > Right now, it looks like curing the paint in two steps is the key... The
> > first cure (low temp - 120C) gets the paint strong enough to resist
> solvent,
> > but not too resistant so that the solvent would remove only the
> toner-masked
> > areas. The second cure (high temp - 160C) really fixes the paint in place
> > and makes it solvent resistant.
> >
>
>  
>


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