I do not work on Lugers but on many other guns I have used nail polish for various lettering or sights. I have used white for the markings on M1a rifles rear sights. I have found it best to fill the lettering with a toothpick dipped in the nail polish or sometimes you can use the little brush. Don't worry about excess. Let it dry and then get a Q tip dipped slightly in acetone or nail polish remover and gently take off the excess. You must change Q tips a lot. Once you get the hang of it it is easy.
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