I know this might sound a bit silly, but is it not possible that instead in faffing about with filling the holes, that could simply put a thin piece of paper tape across instead and then do the conductive paint (or even pencil!) across to close the bridges.
AMD Is An Anagram Of MAD, Intel Is An Anagram Of INLET, Cyrix...Ah Who Cares?
AMD Is An Anagram Of MAD, Intel Is An Anagram Of INLET, Cyrix...Ah Who Cares?