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Author Message   David_nebenzahl Tinkerer Username: David_nebenzahl Post Number: 251 Registered: 12-2009 Rating: N/A Votes: 0 Posted on Saturday, April 03, 2010 - 10:41 am:    Marek--good one. (I haven't finished reading your posting in detail yet but skimmed it and got the gist of it.) Another tip: for certain kinds of engraving, it's even easier to use ordinary nail polish. I use this to fill in red dots, lines, arrows, etc., that have become faded. Just brush the lacquer (that's what nail polish is) into the engraving, intentionally letting it slop over just a little bit so it covers the edge. Let it dry, then take a Q-tip (cotton bud) just moistened with lacquer thinner, and clean up around the engraving until all that's left is the lacquer in the depression. I guess this could work for lens-front lettering as well, except that I don't know of any white nail polish.