Homebrew PCBs

I made up a board on a CAD transfer program, and printed it off on a
transparency.  I exposed it to my homebrew UV LED array for 1'30" and
transferred it to a store baught developer.  I agitated it in the developer
at the recommended 10:1 concentration for well over 5 minutes and the light
sensitive coating showed no sign of coming off.  I exposed it again for a
solid 5 minutes, and again put it in the developer with no sign of any
action.  I have left in the back yard now to see if it will finally come
off.  It does look like some milky looking material is slowly coming off,
but this is MUCH longer than I expected.  I am asuming all the positive
boards require the same NaOH solution, so I don't think that's the problem,
but I am not sure.

Any suggestions?

Thanks,
Chris Maness


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