Homebrew PCBs

> How will you tell if the resist needs touching up?
> 
hhhmmmm,, I dunno if I understand-- you mean how do I know if a 
mistake has been made after the developer? it would be obvious I 
assume once compared to the artwork. Things like creep, poorly filled 
areas, etc.(in most cases could be manually cirrected with additional 
re-touch work, but if not then...) A hypothetical problem that I 
assume would render the pcb unusable for developing thereafter,, 
correct? I mean to suggest that there are no re-dos for a 
presensitized PCB unless you have some UV sensitive material to 
spread back over the cleaned board? (I personally don't yet).

 What else can I use to get the resist off the PCB after development? 
I'm on a harsh budget so cannot go out and buy more chems than what I 
curentluy have on hand.

 Thanks in advance, Jd

--- In Homebrew_PCBs@yahoogroups.com, "Leon" <leon355@...> wrote:
>
> ----- Original Message ----- 
> From: "timbomcnuckle" <jaydag71@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Tuesday, August 14, 2007 7:06 PM
> Subject: [Homebrew_PCBs] UV developer re-do's....how to??
> 
> 
> > Hullo again all,, I am having a bit of a problem with figuring out
> > how ,if anyway, one is able to do a touch up when making a 
transfer
> > based on the UV developer method-- I realize that it is likely 
that
> > there is no help there due to the nature of the process itself, 
but am
> > hoping the assumption is wrong?
> 
> How will you tell if the resist needs touching up?
> 
> >
> > I'm not in any trouble here, just curious-- I have way more 
experience
> > with doing the plain-jane TT pcbs's but have most of the equip to 
do
> > both methods (except for a good light source and the right 
transparency
> > materials).
> >
> > Also, if there is no method to amend the mistake after making a 
foul-
> > up, how easy is it to remove the resulting transfer and just use 
the
> > ol' fashion TT method thereafter? what is the best solvent to use 
for
> > removal?
> 
> Sodium hydroxide solution (stronger than that used for development) 
will 
> remove the resist in a few minutes, or you could rub the board with 
a paper 
> towel and IPA.
> 
> Leon
>