stephan
Retro Guru
I suggest if your going to use the nail varnish, clean the scratches out with 70% Isopropyl alcohol, or at least clear nail varnish remover and let it dry out, then get some steel/car panel primmer paint and apply that to the scratches with a small/fine paint brush to build up before a coat of your varnish of choice, the varnish itself wont fill the "void" of the scratches.