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Subject: Re: [Homebrew_PCBs] Re: Dry film woes

From: DJ Delorie <dj@...>
Date: 2008-10-12

"pixelcanvas" <pixelcanvas@...> writes:
> The film is surprisingly resilien after it sets, I scrubed it pretty
> hard with an abrasive sponge and it took me a long time to scrape it
> off one corner. I have to buy some thinner to dissolve it.

Try sodium hydroxide (lye, drain cleaner) - about the same
concentration as the developer. For my film, I drop it in that long
enough to soften the film. When it looks like it's starting to come
off on its own, I take it out and scrape it off with a plastic card.
If you leave it in long enough, it comes off completely and stays in
the tank.