Homebrew PCBs

Hi all

Now i have been out of making Projects and PCB'S for some yrs now
and have just got back into doing it, god what have i missed ?.

I need to make about 3 ltrs of this to use in my PA104 etch tank.
Now my dad used to use this stuff ages ago (15yrs), but sadley
he's no longer with us!. I think as i can remember he used to put
a bit of salt in his mix, to give it a bit of a kick!!.

Anyway what i am wanting to know is, how meny grams of Ammonium 
persulfate do i mix to 3 ltrs of water, to etch Fotoboard 2 pcb ?

Also is caustic soda ok to use as a developer for Fotoboard 2 ?
and to make 1 ltr how meny grams to mix with water ?.

Thanks in advance
Howard