Homebrew PCBs

On Mon, 07 Nov 2005 23:51:25 +0100, lcdpublishing  
<lcdpublishing@...> wrote:

> Hi Adrian,
> Thanks for the info. The boards do etch fine, I just can't get toner
> to stick to them.  However, I am sure there is something on the boards
> making them stay shiny and also there is a good chance they use
> something in the mfg process to lubricate the rollers and such while
> forming the copper.  However, I would think if they used silicone
> during the copper mfg. process, they would have trouble bonding the
> copper to the epoxy-glass boards.
> WIll report back any further findings...
> Thanks again!
> Chris


Chris,

it makes no sense to coat the PCBs with something that prevents coating  
with resist, intentionally or by accident.
The manufacturer could not sell the material so he can not produce it.
If it was coated with some "mystery material" it must have been by  
accident later on, or maybe a silly person "preventing corrosion".

In PCB houses the boards are cleaned by motorised scrubbers and water  
only, usually, i'm told.

ST