Homebrew PCBs

Sorry, I meant 5mm glass.
I made my transparency with inkject transparency paper, using a inkjet
printer. It came out pretty well, and as I sais, I made two PCBs out
of it, and one of then, more expossed, came out perfectly defined. But
I think it is overexpossed as all tracks were thiner, and one little
part dissapear...
So, I suppose I should try less expossure time?

The non-defined borders could be due to ?
- trying to clean the board while developing (to see if copper was
completely visible)??
- little expossure time??