Homebrew PCBs

> What type of etching solution do you use ? I assume 
> everything is plastic, including the nozzles. A 1,5hp pump 
> definitely is a good size. I was thinking of using more like 
> 1/4 hp centrifuge pump. to give 1,5 bar at 20 liters/minute. 
> That should be enough for a single sided spray etch with 
> sweeping spray nozzles. Does the spray oscillate in any way 
> or is both the PCB and the spray stay still during the 
> entire etching time ?
> 
> I do not have any solder mask material yet. Does the 
> soldermask you own work by photo imaging ? If so then does 
> it also develop in 1% sodium carbonate ?

the pcb oscillate about 10 cm 
10 nozzles per side makes 20 off it 
volume off etch is about 25 liters 
i use the fe3 the brown fluid.
the soldermask works the same way - only after developing extra uv 
cure and after that an oven cure for 60 min at 159 C if you can get 
the same film (dynachem laminar DM)

gr. Roel

i got lot off documents about the chems for plating and