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Subject: Drilling before exposing

From: "sciciora" <ciciora@...>
Date: 2003-12-26

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