Homebrew PCBs

"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.