Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Jack:

I admit I have used ONLY one kind of that "spray-on, photo-sensitive resist",
and it ALWAYS came off instantly with JUST lacquer thinner. BUT, I imagine
it may be possible that it "time-hardens", if not cleaned off within a week
(?).

I would try 50/50 Amyl Acetate (that's Laq.Thin., I THINK), and Acetone, Let
it Soak (if you don't have a shallow pan, you would have to "paint it on"
continuously, and 90% would be lost by evaporation very quickly, AND, it'd be
dangerous! DO this outdoors, if you do it at all, and wear "surgical
gloves", at least!)

Try "pushing it off" with bits of Scotchbrite, after it has soaked several
minutes to a quarter hour. It MAY be quite soft, just not "fluid", after
"aging".

Some Chemguru in here know the answer???

Jan Rowland


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