A fine tipped brush and signpainter's ink works fine also. U want a
paint that is not water soluable, and dries quickly. Sharpies are the
right type ink, but go on much too thin. When push comes to shove, I
just get my girlfriend to donate one of the many colors she doesn't
use anymore. I even use the internal brush!! The idea is to save the
copper. U can always scratch off the excess copper after the pcb is
etched. Etch on, Dudes! afn Tone
--- In
Homebrew_PCBs@yahoogroups.com, Gordon Couger
<gordon.couger@...> wrote:
>
> Why not just a brush and a few coats of India Ink or paint. You can
> make a mask if you can't do it free hand. A good bush with long
bristles
> is easier to use than it looks.
>
> Gordon
>
> dl5012 wrote:
> >
> > Hi John,
> >
> > Don't bother trying the ultrafine point Sharpie markers. The ink
> > doesn't work as an etch resist... Same goes for the "huge" chisel
> > point industrial marker. I thought that tip would be good for going
> > over large copper fill areas...
> >
> > I've used the black fine point Sharpie as an etch resist for
> > decades. For narrow traces, I've used slots cut in transparencies
> > as templates. I use an eraser shield and a firm eraser to clean up
> > the edges. Eraser shields are surprisingly difficult to find these
> > days; drafting (drawing by hand) must be becoming a lost art. The
> > last batch I bought at a craft store; poor quality with sharp edges,
> > but better than nothing. In a pinch, you could use a transparency
> > with slots cut out.
> >
> > Another option is to use "Ruby" tape. This is a red transparent
> > tape they used to use this in the old days to layout PCB (and
> > integrated circuit layout) by hand. It works fine as long as you
> > don't have any "crossings" where etchant can get under the tape.
> >
> > Yet a third option is to locate some rub-on transfers. I have some
> > sheets that have traces and pad patterns (but haven't seen them for
> > decades...).
> >
> > Regards,
> > Dennis
> >
> > --- In Homebrew_PCBs@yahoogroups.com
> > <mailto:Homebrew_PCBs%40yahoogroups.com>, "Jan Kok" <jan.kok.5y@>
> > wrote:
> > >
> > > I believe there is an "ultrafine point" sharpie.
> > >
> > > I haven't tried it, but maybe you could cut two sides off a "fine
> > > point" sharpie with a razor blade, to get a very narrow tip.
> > >
> > > Cheers,
> > > - Jan
> > >
> >
> >
>