Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@g...> wrote:
> 
> On Thu, 11 Nov 2004 14:44:38 -0000, mikezcnc <eemikez@c...> wrote:
> 
> >
> > 4. There was something listed here to remove the laminated toner but
> > I don't remember what it was. The usual acetone is just too terrible.
> > Maybe it was Stefan's suggestion to use a paint thinner?
> 
> I don't know why acetone is terrible, but it attacks the epoxy,
leading to  
> toner smeared into it.
> Paint thinner doesn't do that. From a health point of view acetone
is much  
> better than paint thinner.

You know, I don't understand why you are having this problem with
acetone.  I use it and it leaves no stains on my FR4 material what so
ever.  I can clean off a botched legend print and go again.  I wonder
if its an issue with the toner or something in the PCB material.  I
recall having trouble with a radio shack copper clad board but that
wasn't FR4 (can't recall what it was).

For me, acetone is worth the precautions it takes to be safe
(ventilation).  It takes the toner off in seconds.  I also use it for
board prep - it degreases the copper perfectly and leaves no residue.