For ultra durable chrome/silver you have to check the quality within the resins but also it is important to know that the lesser shiny silver paints tend to be more durable. Some spraypaint brands offer cheap paints but with a lack of durability because of a lower quality of resins/hardeners.
SPARVAR RALLYE is among the most durable in the market, this is really oldskool with its special smell and low pressure! Matte silver finish. A real collector's item...
AKA COLORS is for its price/quality the best option! Matte silver finish. For the moment only available in the Benelux at my store.
MOLOTOW BURNER CHROME is among the most agreable, most silent, and fastest to use, with a real shiny finish.
The MTN Colors water based silver paints are also of a really durable quality (matte finish) in case that you need to do interior paintings.