Homebrew PCBs

Morris,

its probaly negative resist that has been exposed or aged,
Xylene or Xyloh(Xylene with Alcohol) should remove it, 
you may need to soak for a while if its old.

BoonS

--- In Homebrew_PCBs@yahoogroups.com, Colin & Alma Lane 
<clan1623@...> wrote:
>
> Try lacquer thinners then steel wool & ajax. Colin
> On 28/12/2008, at 12:44 PM, morriso2002 wrote:
> 
> > Hi all,
> >
> > I obtained some surplus PCB material recently which was pre-
coated
> > with some sort of photo resist. The coating is red/orange 
coloured
> > and in poor condition. My question is, How can I get this stuff 
off?
> > I have tried acetone, alcohol, soap & water, citrus cleaner and
> > Shellite (a hydrocarbon based solvent) all to no or little avail.
> >
> > Anybody recognise this stuff and know how to remove it?
> >
> > Thanks,
> >
> > Morris
> >
> >
> >
> >
> > ------------------------------------
> >
> > Be sure to visit the group home and check for new Links, Files, 
and  
> > Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
> 
> Alma & Colin Lane
> Adelaide, South Australia
> Skype     colinalma
> clan1623@...
> 
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>