.008 is a teensy trace, barely visible under the solder mask. Not good for a power/ground
traces. Most "signal" traces are 12 mils or so, although .008 is probably common nowadays
with smt parts, and power/ground traces somewhat larger. I recently bought a shield that
uses approx .008 traces, and I hate the darn thing. But then, I like to be able to "fix"
broken boards, and modify the circuitry for my own purposes.