>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.htm
>
>6" 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.
www.schuricht.de or www.distrelec.com do have this product. No idea
though if they deliver to the US. Worth a try though since they also
have an online shop.
I haven't followed the thread, but I wonder why one want's to use this
spray. I use either pre coated material or then dry film resist, but
anyways....
Markus