Homebrew PCBs

Don't think that I got the last message.
 
The ink that I used was specifically Sericol Fast Dry Enamel, White.
http://www.sericol.com/GraphicScreen/GSImages/PDFSheets/Solventbased/Fas
tDryEnamel.pdf
 
I also bought some Nazdar gloss white enamel ink, don't have the link
handy right now, that I think would work as well, but would dry slower.
I believe that a period of "baking" the ink with either an infrared
heater or an oven might improve the hardness and the ink's resistance to
lifting in the etch.  I am not so sure that the type of ink is critical,
as long as it is solvent based rather than plastisol or water based.  If
a person could find a lacquer that was thick enough to silkscreen with,
it would probably work.  Silkscreen ink is THICK.  About like mayonnaise
but not quite peanut butter.  When you scoop some out of the can, the
hole fills in fairly slowly.  I don't think normal paint, (runny) would
work.  In fact, I know it won't since I tried it a few years ago and it
made a real mess.  I don't know what country you live in, but I am sure
that any screen printer will have access to an ink that he has to clean
out of the screen with mineral spirits or lacquer thinner or some other
solvent that stinks a lot.  With either Nazdar or Sericol ink, you are
supposed to thin the ink with about 10% of solvent.  It is still a lot
thicker than paint. 
 
Hope this helps.
 
Kevin
 
 

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of juanabba
Sent: Friday, March 23, 2007 10:51 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: paint board cooper image using silk screen
- someone with experience



> > Kevin
> hi Kevin
> Thanks a lot for the comprehensive answer.
> I am trying to get the elements down here ( or finding a local
> replacement ) so I can try out your method.
> 
> The doubt I have at this moment is the ink you use to silk screen the
> cooper after producing your mask.
> You mention "white solvent based glossy ink"), is that the correct
> spec????
> But before I understood you use either 
> a> fuji (sericol) quick dry enamel ink
> or
> b> Nazdar ink would be fine to
> 
> can you pls clarify this.??
> 
> Thanks again, you are being extremely helpful
> 
> best regards
> juan
> 
hi Kevin
sorry for coming back to question
can you pls look at my last question above
best regards and thanks again
juan



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