Homebrew PCBs

----- Original Message ----- 
From: "morriso2002" <vilgotch@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Sunday, December 28, 2008 2:14 AM
Subject: [Homebrew_PCBs] PCB resist cleaning question


> 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?

Try leaving them in NaOH solution. It's a developer, but a concentrated 
solution is used for stripping the resist. It depends on the resist, though. 
Rubbing with IPA might work, as well.

Leon