Homebrew PCBs

Chris Maness wrote:
> 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.

Positive resist or negative?