Homebrew PCBs

RE: the ink that is used for PCBs...does it have a long shelf life?
It reminds me of the ink that is used to make silk-screens
for tee shirts and the like.

Thanks,
Charlie

On Sat, 29 Jun 2013 12:40:52 -0300 Gustavo Villada <villada@...>
writes:
  
On Sat, Jun 29, 2013 at 12:45 AM, James <bitsyboffin@...> wrote:

> **
>
>
> On 29/06/13 14:47, Terry wrote:
> >
> > So, to clarify, are you saying to spread the ink on the board, then
> > cover with cellophane? Then while still wet, place the mask and
expose?
> > .
> >
> >
> >
>
> Yes that's correct.
>
> Thin layer of the ink (paint, whatever you want to call it), cover it
> (still wet) with your cellophane (or other suitable plastic which
> works), put your artwork against the cellophane, expose for XX minutes,
> remove artwork, peel off cellophane. The unexposed areas (black in your
> artwork) will be wet and simply wipe clean, the exposed areas will be
> cured hard like epoxy.
>
> The ink is cured (dried and hardened) by UV, drying it any other way is
> virtually impossible, and just makes it really hard to remove the
> unexposed areas afterwards.
>
> The cellophane (whatever) covering serves two purposes, one it keeps
the
> ink off your artwork, and two it seals the ink against air while you
are
> exposing it - air inhibits curing.
>
>
I test today and work fine, but I'll need to buy a couple of UV tubes
since
this winter is raining a lot :(

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