Homebrew PCBs

Gentlemen,
For over thirty years I have been making PCB boards using a 
photographic method.

The pre coated board I have been using is -ve acting.

This requires a negative to be produced from the +ve computer 
generated artwork. For many years I used an orange (UV opaque) 
material made by 3M.

This was taken off the market and I switched to an AGFA 
Printon  Ortho daylight film. This was far superior than the orange 
film however the section of AGFA that made this film went out of 
business a couple of years ago.

Try as I might I can't find a replacement for this film.

What I need is a method that can make a high contrast UV opaque 
negative from a positive printed on cleat plastic.

Anyone have any suggestons?

Thanks

David


David G. Hopkins (Vk4ZF)
CAPALABA QLD.
AUSTRALIA
S27 32.191 E153 11.867