--- 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.