Homebrew PCBs

Hi guys,

I have almost given up on direct ink-jet resist and on "plotting" 
with Staedtler pens using the CNC machine, and I am about to abandon 
toner transfer.  Only problem with toner transfer is the "scaling" 
issues either through the printer or from the paper not being stable 
which causes problem with CNC drilling.

Anyway, I ordered up some negative type resist chemical, the 
developer, a lamp, and an exposure frame.  I am not expecting this 
to go "perfectly" either, but am hoping to have a bit less 
frustration in other areas.

I am thinking the best accuracy I can get when printing is to use an 
ink jet printer (I have Epson R220 and Epson CX6600).  I have a PDF 
editor program that allows me to edit trace colors and back ground 
colors so that I can make negatives so that shouldn't be a problem.

The first "problem" I suspect I will run into is getting enough 
density on the transparency to make sure the "black" areas are dense 
enough to block out the UV exposure lamp where needed.  Has anyone  
run into this issue and how do you deal with it?

Any other pointers would be greatly appreciated as well as this is 
my first time for "photo-processing".

Thanks

Chris