Homebrew PCBs

"I'm not convinced those slots will be small enough to prevent the 
vapor coming out when the bubbler is on."

Those slots can be sealed whith soft rubber material like surgical 
gloves. I understand that you keep the etchant in tank when you don't 
use it. Am I wright?

"Anyway, if you make that pendulum, why not attach soft plastic 
brushes that brush the board? might be more uniform, and the wiping 
action surely mixes the etchant well enough." 

I'm totaly agree whith this opinion. All my actual boards is made 
whith a bowl and a sponge brush. The quality of etched board is very 
good.

"A spray etcher may not be that much more complicated in the end."
Yes if we solve the pump corosion problem.  
 
"I'm not gonna try that any time soon, since my setup is just too 
simple  and too well working to change.

Tell me Stefan, you use a homemade tube or a comercialy one like those 
make it for aquariums, or a long stone? 

"duh if a stone is too uneven sitting there then move it"

Is perfect true. Moving the bubbler or the board orizontaly is much 
better. But this don't solve the problem of differences between top 
and bottom of the board.




Adrian