Homebrew PCBs

On Fri, 2003-05-23 at 00:24, Stefan Trethan wrote:
> i would really try to use the photosensitive laquer which is developed
> with soda ash.
> i think you can apply this without using the screen.
> maybe spraying is an option.
> then proceed it very like a normal pcb.
> (someone sayd solder stop is simply the negative of the copper artwork
> - this is not true because you 
> want your tracks covered. but any pcb software should be able to
> produce it. if not make a layer with no 
> traces but (bigger) pads. invert and print.)

  Whoops, that would be me.  Not sure what I was thinking when I wrote
that.  What I meant to say was I would plot a negative of the pattern
without traces.  Back on topic, can anyone tell me what type of liquid
photo-resist (available in the USA) they use which can give consistent,
repeatable results?  I've tried two types of liquid resist; one which
was developed using a caustic solution, and one which was developed
using a very aggressive solvent.  Neither one worked very well and I had
a terrible time getting consistent results.  Also, are any of this
liquid resists visible after exposure?  That's what I really enjoy about
the dry-film resist; the pattern is very clear after exposure and you
can usually tell when you've under/over-exposed just by looking at it.

Larry