Homebrew PCBs

> I think I read about surface tension of the etchant and exposure of
> the coppper being different if it was submerged and bubbled and
> sprayed.  IIRC, spraying acutally allowed the etchant to be removed
> down to the copper whereas the think film of etchant with bubbling
> never really did.
>
> Dave
>

must be the cause. moving the board seems to work ok, and it is zero-mist 
also.

I wonder what a ultrasonic transducer would cause?
I mean it also rips off the etchant, doesn't it? the question is if the 
resist
would survive (anyone having a ultrasonic please put a board with resist 
in and tell us).

ST