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?