Over the years I've done extensive research on Chrome Rattle Can Paints. Had one from ColorWorks Chrome Plate which did not grey when it was waxed or Nu-Finish coated (after drying one day). Unfortunately: ColorWorks like many other small paint manufacturers was purchased by Sherwin-Williams and this product line was discontinued.
To date the only other TRUE chrome finish rattle can product that actually works is from Alsa Corp. it's a 3 12oz can kit that has a Gloss Black primer/base coat, Chrome color coat and clear top coat. It is a wonderful product but the coat is at minimum $139.00 per kit. It does not pick up finger prints, smudge or grey when Nu-Finish coated.
Like you I used Duplicolor Chrome Silver on my Micro-Maxx Dwendeled Dead Ringer 10years ago and I still can not handle it without white cotton gloves. Flies fine but don't touch the surface with bare hands or try to apply any type of overcoat or wax which immediately greys the surface as seen on the Deep Space Transport which was Mirror finished until I Clear Coated it, turning the Mirror Chrome into a Dull Grey surface.