We needed a PCB making for a simple stepper motor driver and thought "why can't we use the laser?". A quick trip to maplins we had a copper clad board and some grey automotive primer.
1) Spray board with Primer
2) Engrave board with design
3) Etch Board
4) Remove remaining primer with acetone
5) Solder Board!
You will have to excuse the soldering - My drill bit was too large and i didn't have any flux!
We are not going to be making proffesional boards like this but for a clean, high speed way to make a PCB its pretty good.