The spray you need is named POSITIVE 20 made by KONTAKT CHEMIE has Art.
No. 20.820.6.04.25.02
I got my last can from the UK, but can't find the source right now.
I used Circuit Specialists for a while until they jacked up the price
too much, then I found
http://www.oselectronics.com/ose_p78.htm6" X 9" double side board for $9.90
About the Positive 20:
I used it for many years, the trick is to clean the PCB ONLY with Ajax
powder and water. Make a small paper towel pad, wet it and the board
then apply Ajax powder and rub in small circles. DO NOT use wire wool.
The reason: Ajax powder makes the surface much smoother and when you
spray the Positive 20 on it, the surface tension is far lower and it
allows the Positive 20 to spreads in an even film. ( no need to spin it
and all that other crap... )
If you use wire wool the Positive 20 will bead and not spread, and after
using wire wool there is NO hope of getting Positive 20 to spread evenly
unless you spin it... and that's a big mess.
Dry it in a dust free environment, you can also speed up drying by
placing in a warm oven.
Positive 20 exposes fine with a Garden Grow Lamp, and develops very well
using household Lye ( I use Red Devil Lye)
Good luck...
hansw
PS may be some one form UK knows where it can be purchased.
Ben wrote:
> The only one that makes it that I know of is GC Electronics.
>
> Cat.# 22-0074-0000
>
> Now I am not sure about a stocking dist., so far the ones I looked
> up don't seem to stock this product.
>
> I used it 11 or so years ago found it more trouble than it was worth
> to use.
>
> I use MG Chemicals presensitized boards 600 series, have very good
> results using them. GC Electronics also makes some also.
>
> For the MG Chemicals I buy them thru Circuits Specialist, Inc.
> www.web-tronics.com Circuit Specialist also has some pos.
> presensitized boards slightly lower price than the MG Chemicals but
> I have not tried them. You can also get most everything you need in
> supplies at Circuit Specialists.
>
> Ben H. Lanmon
> bhleavi@...
> benhlanmon@...
>
> --- In Homebrew_PCBs@yahoogroups.com, Neil <cobra_neil@a...> wrote:
> > I recently asked this as well. From the archives, the only place
> I could find
> > in the US is www.thinktink.com for a dry-film laminated method.
> I'm still
> > also looking for a spray-can source in the US.
> >
> > Cheers,
> > -Neil.
> >
> >
> >
> > On Saturday 05 July 2003 14:48, jackafaz scribbled:
> > > Hi,
> > >
> > > Would someone please let me know where I can purchase
> Positive
> > > Photo Resist in a spray can, mail order, in the US? I have done a
> > > bunch of searches and have had no luck. I have seen others ask
> this
> > > same question but have yet to see an answer. Your information
> would
> > > sure be appreciated. Thanks - Jack
> > >
> > >
> > >
> > > Be sure to visit the group home and check for new Bookmarks and
> files:
> > > http://groups.yahoo.com/group/Homebrew_PCBs
> > >
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> > >
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> > >
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