Homebrew PCBs

Adam Seychell wrote:

> I was wondering if anyone has tried sticking a two pieces of sponge or
> a pile fabric to the inside walls of a vertical tank. When the PCB is
> immersed and moved around, it rubs on the fabric.
> 

Developing solutions run something above pH 10, i guess that every easy
to find fabric will not last in such solution.

I just can't answer you with a low space requirement solution that
works. It's dry film and i use TT (until i get a direct print
something). But where i used dry film, after the spray developer we used
a first rinse, then a running water rinse, take look and finally 2 times
in the spray rinse. We only had considerable problems when was time to
change the developer. The spray machine used fan-cone nozzles and the
first rinse the water was only changed along the developer, the spray
rinse used rows of straight nozzles. If you build a spray developer make
it with a square box, the board enters in diagonal and the nozzles are
on the other 2 corners, it's more simpler to build and smaller. 

But i can give one suggestion. I guess by your words you don't have a
spray rinse (very useful for who owns a plating system like you). So you
may try to use a bubble tank for developing and clean water spray right
after, or maybe going from one to other more than once. You won't need
any pump for this since tap water have enough pressure for 8 or so (4
per side) small spray nozzles. If you go right from one to other should
give results. I can't promise that will work since water pH is not high
enough to make dry film soluble. But it can shake the dry film a bit and
is my simplest idea.