While not entirely conclusive, there is evidence suggesting that differences in pigment and reflectivity can result in minor variations in heat absorption. For instance, blue finishes might balance absorption and reflection differently than a darker or lighter color, though most manufacturers—including Tesla—apply coatings designed to mitigate extreme variations in thermal load. Consequently, any observed impacts on battery temperature regulation tend to fall within the safe design margins of the thermal management system.
It’s also worth noting that long-term, concerns typically center on UV degradation of both paint and underlying material, which could indirectly affect system components over many years. However, the industry standard uses additives and treatments in the paint composition to resist UV damage, so significant impacts on the thermal system’s integrity aren't commonly reported.
In short, while the paint's properties can have subtle effects, they are generally considered negligible in terms of overall energy efficiency and battery regulation, thanks to integrated design safety factors in electric vehicles.