Homebrew PCBs

----- 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