Homebrew PCBs

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.



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