Homebrew PCBs

>But it seems that when I took it out of the developer, and tried to 
>clean with a soft dumped paper, some of the etch-resistant tended 
>to difuse.

Use a foam brush to **lightly** wipe the board while it's developing 
in the solution. Just use the weight of the brush instead of 
pressing down with it on the board while wiping. Turn the board over 
to wipe the other side.

Wiping not only speeds up the process but it also allows you to see 
the exposed copper areas more clearly. It's done when all exposed 
copper areas show no traces whatsoever of etch resist. Tracks should 
be clearly defined without a "haze" of etch resist between them. 

Remove the board from the solution when done and hold it under 
running water, do both sides. Use compressed air to dry then 
inspect. You can also pat the board with a paper towel instead of 
using compressed air.

Typically, the above takes 3 to 5 minutes provided the boards are 
relatively new and they weren't underexposed. Here's a picture of a 
foam brush;

http://www.circuitspecialists.com/products/full/3758.jpg


--- In Homebrew_PCBs@yahoogroups.com, "patroclus04" 
<patroclus04@...> wrote:
>