[sdiy] pcb question

[mostaware at mac.com]

>
> However the limitation now is in the etching process.
> Using a bubble or spay etch machine 10mil traces work ok for single 
> sided
> boards.
> But for dual sided layouts things get tricky, at least using my single
> nozzle spray etch tank.
> I have to turn over the PCB every 10 seconds or so, otherwise the tiny
> traces get eaten away while etching the second side of the board.
>

couldn't you etch each side separate?  Cover one side with some plastic 
self-adhesive sheet or something like packing tape.  etch one side and 
then tape this side and etch the other?  Just an idea.  I wouldn't be 
doing 10mil traces yet anyway.

The iron-on method isn't working so well, btw.  I'm using 30mil traces 
and many of them are just flaking off the PCB.  :(