Homebrew PCBs

It sounds similar.  For wood projects I use 100, then 180, then 220.  
sometimes 320 for really fine stuff.

220 is a bit too coarse for substrate prep but its what I had.  think 
and tinker have a "cleanser/brightener" that I'm thinking of trying.

by the way, that posting took over 2 hours to show up.  I thought it 
had gotten lost somewhere and, of course, it was one of the few times 
didn't save a copy.

Phil

--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan 
<stefan_trethan@g...> wrote:
> I wonder if the grit is the same in your country as in mine.
> i think it is some "peaks per area" reading so i guess it is 
different 
> between
> metric and imperial.
> 
> Does anyone know that?
> 
> I use 600 grit for the pcb prep.
> this is very fine paper, the coarsest you get is 40,
> 60, 80 or 100 being used for common wood sanding.
> 
> 
> > Copper substrate prep is pretty standard except I use emery cloth 
at
> > 220 grit to significanly increase the surface area to improve 
toner
> > bonding. I'm going to try something finer than that. wash, 
degrease
> > and dry in oven.
> >
> 
> Nice results, especially the legend.
> But some pads could be bigger you know....
> 
> st