> You are looking for photoresist. Comes in two kinds: liquid or spray-on.

Applying your own photoresist is similar to using laser printers to make
your own PCBs - the results are very dependant on method, knack and
attention to details and being a competent craftsman can help a lot. If you
are prepared to work at it you can get good results. If you do it half
heartedly you can expect variable and unacceptable results.

        RM

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