Homebrew PCBs

I found: expose, develop, drill, etch worked best for me. When I 
drilled after etching, I always seemed to screw up some pads. 
Undoubtedly I was using too low an RPM or inadequate bits. However, I 
never had problems drilling before etching. Gave much more room for 
error.

-tdi

--- In Homebrew_PCBs@yahoogroups.com, "sciciora" <ciciora@C...> wrote:
> I just tried drilling a PCB before exposing it, and it didn't seem 
> like a better method.  Spinning carbide drills at 30k rpm, the green 
> photosensitive coating flaked off near the holes.  Just like 
sheering 
> the boards before exposing them.  So, I think for the near future, 
> I'll expose, develop, etch, _then_ drill.
> 
> Does anyone know for how long they are photosensitive?  Are they 
> still sensitive after develping?  Do I have to etch in the dark?
> 
> Thanks!
> 
> - Steven Ciciora