Homebrew PCBs

I will be (within a few weeks) testing out plotting / etching with 
Staedtler pens.  I made up a pen holder for my CNC machine and am 
working out a few other details for direct import of the Gerber data.  
Once complete, I will be trying this process out first hand.

The Super Fine pens seem to plot about a .015" wide trace which 
severly restricts layouts (relative to what I have been doing so far).

I went for the Staedtler pens based on SO MANY recomendations here 
from SO MANY people as to how well it holds up to etching.  Aside from 
putting the ink on the copper, has anyone had to do any other special 
treatments (heating, drying, etc.) before performing the etching 
process?

Thanks

Chris