Homebrew PCBs

Hi All,
After looking at Craig's fasinating PCB spinning methods, an idea came to mind, seeing as the regular chemicals seem to be rare and expensive, has anyone tried silk screen printing emulsions? this in not the inks but the chemical used to make the pattern in a very fine mesh, the emulsion is spread over the mesh with a squeegy and after exposure to UV through the pattern[design] blocking transparency, the unexposed area is washed out with running water, the exposed area remains and is really pretty tough, is this resistant to etching chemicals? would this method work? has anyone tried?
There would be no need to "develop" the PCB, just wash off with water!!
I may be way off track with this but any comments and/or suggestions?

David