Homebrew PCBs

> andrewm wrote:
> Here in OZ they still sell electrolube brand
> positive photo resist in a spray can.
> <SNIP>

> Leon wrote:
> That's the stuff I can't get to work. I asked
> Electrolube about it at a  show, and they
> admitted it wasn't much good.

It is not brilliant ony fair to middling.

No where near as good as the Kinsten brand
pre-sensitised ones I use for PCBs.  But when
you want to photo-etch something that is not
a PCB - it does work.

Problems I found from trial and error.

1, Not shaking the can for long enough.
2, Not being in total dark when spraying
3, Too much moisture in the air when drying
   (steamy summer night in QLD and it sucks)
4, Following the manufactures instructions
   with regards to coating thickness.

Don't listen to the instruction.  Put it on
good and thick.  Two coats I reckon.  This
might limit your ultimate resolution.  The
thicker coating may mean your line thickness
will vary.  But if your asking about spray
on resists these days - I am guessing it is
not for a normal everyday PCB or you would
probably be getting pre-coated or a dry film
laminator.