Homebrew PCBs

>  Just though of something.  What if you did the above,  but deposited
>  etching paste to start etching the areas you did not want.  After
>  laying down the paste, you could spray the board with acrylic/enamel
>  paint as a mask, dry a few minutes with a hair dryer, wash the paste
>  off then do your etching.  I will try latter today if I can.

Would that not damage the needle? how about a grease before spraying,
can you taste its not butter.....