Homebrew PCBs

Yes it has for many of years.
commercial company's used that process.
work for double side boards also.
Robert





Philip Pemberton wrote:
> drmail377 wrote:
>   
>> This has probably been raised before; but has anyone tried this for putting etch resist on PCB's?
>>     
>
> No, but it fits the first requirement -- "it looks like it might work".
>
> I wouldn't use sign vinyl though -- in fact, I'd try and find some form of 
> photoresist coating for screen-printing. A few years ago I was thumbing 
> through a catalogue for a British company called "Specialist Crafts", who 
> supplied all manner of arts-and-crafts products... including screen-printing 
> equipment. One of the things they sold was a liquid that could be painted on 
> to silk-screens, left to dry, then exposed to light (probably UV, or maybe 
> bright sunlight), and then rinsed in water to remove the exposed mask. Once 
> you'd finished, you cleaned the screen with a solvent to remove the rest of 
> the mask.
>
> Unfortunately I can't for the life of me remember what this stuff was called, 
> and it doesn't seem to be on their website either (for that matter, about half 
> of their product range seems to have vanished)...
>
> Removing the 'track' vinyl whilst leaving the masks for small areas (e.g. dots 
> inside pads) would probably be quite difficult. I suspect the cost/benefit 
> ratio would be quite low for something like this... and that's assuming you 
> could find a screen-printable ink or dye that's resistant to etchant.
>
> Thinking along similar lines, aren't most PCBs "silkscreened" by applying a 
> photo-resist like coating to the PCB, hitting it with UV light, then 
> developing with $NASTY_CHEMICAL to remove the areas that were exposed to UV? 
> Sort of like how solder resist is typically applied?
>
>   
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