Chrome Painted Fiberglass Bumpers!!

So is the secret a black basecoat for a chrome looking finish? I "bumper chrome" rattlecanned (awful but it has a bit of a shine) some bezels and they turned out more gray than chrome. Maybe I should paint them black first? $20-40 a can is liveable if that is all you need, NOT black base coat, DA's top clearcoat, etc. I also heard the finished product is rather soft, and yellows over time but that may be the clearcoat. Those do look nice. Too bad my father in law doesnt work for Revell anymore (the model maker, at least 35 years ago) I would be giving him plastic stuff to vacuum plate all day!