Re: PCB prototype problem
Probably it depends in some degree from manifacturer. In general, procedure is
1. Print on transparent film your PCB project.
2.Remove protective adhesive laminate from the board.
3.place printed film on board
4. Expose board with UV lamp ( 300-400nm) for some time. In fact this is biggest problem, because you dont know for how long you shoud expose the board. You must try several times. Exposer time is somewhat about several minutes, depending on your UV lamp. Check google for " UV exposure box"
5.Develop board.
6.Etch.
This technology is not simple, but produce probably best results.