Thanks Leon! Now that makes sense. The mistake I was making was not
shaking the spray can of sensitizer. I can't tell you how many boards
I sprayed in the dark. I was allowed to use a small a red light. After
cleaning the board I would stand them up in the dark and spray them. I
then dried them using an old hair drier. The negative was that red cut
and peal stuff. I did some boards for a local college through a guy at
work. He got his degree and left our company without paying me!
--- In
Homebrew_PCBs@yahoogroups.com, "Leon Heller" <leon_heller@h...>
wrote:
> ----- Original Message -----
> From: "crankorgan" <john@k...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, September 10, 2004 1:15 PM
> Subject: [Homebrew_PCBs] Don't use paper towels
>
>
> >
> > After you clean up your copper surfaces don't use a paper towel on
> > the copper. Air dry the copper. I was told if you rub the board with a
> > paper towel it leaves a coating. I think he said it was some kind of
> > silica? Maybe somebody he knows?
>
> Silicone oil, perhaps. It used to be used on the fuser roller in
some Xerox
> copiers. Don't get it in your eyes, it makes them sore for several
hours
> (speaking from experience).
>
> Leon
> --
> Leon Heller, G1HSM
> http://www.geocities.com/leon_heller