Homebrew PCBs

Exactly what plastic are you using to cover the ink/paint?

--- In Homebrew_PCBs@yahoogroups.com, 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.
> 
> 
> 
> [Non-text portions of this message have been removed]
>