Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Leon,
As you probably realize if you print on transparency material
the image needs to be reversed so that the Ink can be in direct contact
with the photosensitive coating on a board. Otherwise the thickness of
the transparency material allows light to leak around the edges of the
image, resulting in "undercutting " of the image. Wouldn't a gelatin
coating produce the same type of "light path" under the ink image? How
do you propose to evenly apply a gelatin coating THIN enough to avoid
this? Have you had the opportunity to test the process?