Homebrew PCBs

In message <cnc6li+cgqk@...>
          "Phil" <phil1960us@...> wrote:

> Also, I believe that shiny/smooth is actually not what you want.  Some
> degree of roughness will provide for more surface area and thus allow
> a stronger mechanical bond between the toner and the copper.  I got a
> significant quality increase when I started using 600 grit abrasive to
> prep my copper clad blanks.   

Same here - I used to use a green scouring pad (Scotchbrite?), but I always
had tracks that wouldn't transfer. I switched to using 600-grit wet/dry paper
(3M WetOrDry P600) and every single track transferred fine, aside from a few
gaps where I was a little too rough scrubbing off the paper residue.
Thankfully the red permanent Staedtler Lumocolour markers are etch resistant.
Another thing the Staples paper is good for is component overlays - just a
shame it's so hard to get the gelatine (?) residue off.

Later.
-- 
Phil.                              | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem@...              | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.me.uk/          | 48xCD, ARCINv6c IDE, SCSI
... "640K ought to be enough for anybody." - Bill Gate