Homebrew PCBs

Hi, 

I'm still working on making hole walls conductive.
If i use me old drillpress and hss bits the wall is more rougher.
makinng those holes works great(100%). no fails

With the thungsten bits and cnc machine its shiny, so i have to make 
it more rougher- has any one experience with etch the glass !! 

gr Roel