Sponge method for etching PCBs?

Don S. OP (Company: doole) #4285002
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When I make PCBs I place the PCB in an etchant bath and agitate the 
bath.

I saw a video on line for making PCBs and in the video they poured just 
a small amount of etchant over the PCB and rubbed the board with a 
sponge.

Has anyone used this method? Does it work?

Seems there would be a lot less waste using this method.
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