I finished my PCB..less holes. I used Pres'n Peel method from http://www.techniks.com/how_to.htm
Ferric Chloride for etching. carrefully with this make yellowish spots ....
Little messy but not violent like acids. In the past i used a diluted solution of nitric acid (HNO3). Works fine but you must have a right dilution.
If not "eat" copper under mask.