Homebrew PCBs

Theoreticaly, silicone sealant is chemically inert. So should no 
interact whith no other chemical element. This is the reason for 
silicone usings in  medicine.
This is also the reason for bad things. Silicone grease is verry hard 
to remouve. If an object is contaminated whith this grease...bad news. 
Is allmost imposible to paint it, glue it, or etch it.






Adrian 



--- In Homebrew_PCBs@yahoogroups.com, "lcdpublishing" 
<lcdpublishing@y...> wrote:
>
> Last week you all may remember me having a ton of problems getting 
> toner to stick to some PCB material.  Alan suggested that I pre-etch 
> the board to see if that would help.  It was tried and seem to 
improve 
> the adhesion on the smaller test samples, but not on the larger 
> boards.  
> 
> I am wondering if any of you chemically smart folks here can shed 
some 
> light on what would happen to silicone when imersed int he ferric 
> chloride?  
> 
> This new board material is rather shiny, more so than the previous 
> material I have bought in the past.  So I suspect that there is some 
> sort of coating on the boards that is causing me these problems.
> 
> Thanks for the input!
> 
> Chris
>