[gionc]

I don't understand the difference between a rubber film or the adesive red backing film that the pre-sensitive plates has: does this meant that you Steve are doing experiment with Positiv20 laquer?
I never got decent results with it so I'm quite interested to see other's experiences.
It may have incredible developments on the "chemical milling" way on 3D objects: imagine a brass cylinder with radial engravings, ex. a 1/24 alternator; obviously it would need a special UV source all around....