PCB pens

[Rob]

Ajax is even a little bit agressive. I have heard that tartar control
toothpaste works too and is finer.
I myself use brasso, which is just fine silica and naptha mostly. I then
rinse it with water and a little bit of soap and use a sharpie type marker,
they tend to work pretty good.

Rob


----- Original Message -----
From: Mike I. <mirwin1 at istar.ca>
To: <synth-diy at mailhost.bpa.nl>
Sent: Sunday, January 23, 2000 1:56 PM
Subject: Re: PCB pens


> The only way I get good results from "etch resist pens" is to use fine
> scouring powder (such as Ajax cleanser, slightly moistened) to clean the
> copper surface. DO NOT USE STEEL WOOL - even very fine steel wool gouges
> the copper surface and promotes pitting. After scouring, wash the board
> well with warm water, followed by a rinse with methanol, and dry well
> before using the pen. Using scouring powder I get a perfect etch almost
> every time (boards with 15 chips and dozens of other components). I use
> a Staedtler Lumocolor 317 fine-point marker and ferric chloride etchant.
>