Homebrew PCBs

Hi guys,

I tried my first photo process board this weekend and the process 
failed completely.  I am using the dry film, negative resist from MG 
chemicals.

The failure was in the developing of the resist.  While developing, 
all the resist washed off.  It was developed as I could see the 
traces in the resist, but faintly.

The developer solution was a best guess on dilution so this is 
probably my main failure point.  

I am wondering what actually holds the resist to the board though.  
Per the instructions, I am suppose to peel off the backing, apply 
resist to the board and then run it through a laminator twice.  Is 
this what causes the dry film to stick to the board or is it the 
exposure process?

I also suspect that using vellum for the artwork is not a good 
thing.  Using some scraps, I noticed that exposure is much different 
using transparncy than vellum.  So my next attempt will be using 
transparencies and to carefully measure the developer.

Chris