Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "sbdwag" <sbdwag@...> wrote:
>
> Ive heard a few different opinions about the finish of the copper
> surface before etching.
> 
> One theory suggest that its better to have the surface slighly rough
> because it allows the resist layer to grip it better.
> 
> The other theory suggest that its better to have a perfectly smooth
> surface.
> 
> My only evidence is my few successful attempts at etching using PnP. 
I
> used a 320grit 3m sanding block to shine and rough the surface 
before
> etching and the PnP seemed to adhere very will except in a few 
places
> where either I did not have enough toner applied or I did not have
> enough heat and pressure  applied.
> 
> Im going to try using a chemical remover but the question is how do 
I
> remove the residue from the chemicals. If I rinse it with water
> wouldnt that start the oxidation process quicker than leaving the
> board dry?
> 
> Regards
> Wag

I mentioned this in another post I just replied to but I'll add it 
here to yours: I suggest getting 1000 grit sandpaper from the 
automotive section at wal-mart and using that instead. Transfers 
work better when the board is scuffed, but I think 320 grit is a bit 
too rough. Then two wipedowns with 91% isopropyl alcohol. The 
isopropyl should work to remove the residue from your chemicals as 
well. However, to save a step, simply use acetone to remove the toner, 
then do a final wipedown with isopropyl. The acetone won't leave much 
residue itself (though your paper towels might). Check my other reply 
to lcdpublishing for more suggestions on ironing.