> As i said in my previous posting, the difference is either
> pre-sensitized boards or a can of spray-on sensitizer, and a UV-source.

A long time ago in the late 1970s and early 1980s I experimented with
etching my own boards.  At the time at least, the spray on resist was hard
to use.  There was another product I had reasonable success with.  It came
in two parts.  You mixed them shortly before use and painted them onto a
board.  After drying, it left a greenish film.  This was exposed with
white light and developed with plain water.  The only inconvenient part
was that after developing you had to bake the board to make the unetched
resist become permanent.  I think it was called something like "Resolv".
All in all I liked it much better than the lacquer based spray on resist.
I have no idea if it's still available.


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