I worked with a few painting job shops, spending 34 years in the industrial paint and coatings removal business.
A lot of enameling shops use 450 to 500F for "WET" paint. It does vary some from one brand and or type to another.
Powder coaters use from 400 to 950F depending on the type of powder being applied. There are many different powder coatings including ceramics. Some are not so good in sunlight, some are exceptionally wear resistant. These characteristics can change from color to color, because the pigment is a sizeable portion of the volume of what is applied.