Homebrew PCBs

On Sun, 22 Apr 2007 14:00:30 +0200, Russell Shaw <rjshaw@...>  
wrote:

> Bubble and foam etchers are a very gentle agitation and etch everything
> off in most cases. Many times however, traces of copper are left because
> of stubborn resist caused by variations in pcb cleaning, coating, and age
> of chemicals used.
> A spray etcher with proper nozzles has a *very* hard fluid impact  
> compared
> to bubble etchers and really knocks off the last few percent of stubborn
> cases.

Maybe including the resist we want, considering many of us use  
less-than-industrial-strength resist.

ST