Homebrew PCBs

"'RDHeiliger' rdheiliger@... [Homebrew_PCBs]"
<Homebrew_PCBs@yahoogroups.com> writes:
> well. I use cheap board that often have defects and I clean them with
> 400 grit sand paper on an orbital sander. Then I clean the board with
> lacquer thinner. What ever is in lacquer thinner creates a thin oxide
> layer, and aid in adhering the toner to the board. Found this also

I did some experiments a while back, and they make me think that the 400
grit sandpaper step is the key one.  Copper that is TOO shiny won't give
the toner anything to mechanically grab on to.  This is why you can use
transparency film for toner transfer - it's very shiny so the toner
doesn't stick to it as much as it sticks to the copper.

http://www.delorie.com/pcb/transparencies/