Search the web for powder coating, lots of info.
Post3, yes most powder coating is finished with oven bake at 300-425 f for around 10 min.
Some powder coatings can be cured using methods other than ovens with lower temps....think rail tankers....under ground gas pipes...
Surface prep is also a critical step.
Outside powders are formulated with UV stabilizers.
Many surfaces can be coated with powder, mfd for example.
Powder manufactures, see AkzoNoble, or Axalta
Powder, generally is slightly more expensive than wet paint, however, VERY low on VOC's, easy to clean up, more durable than traditional wet paints (wet paints, in the industrial setting, put tons of VOC's into the atmosphere each year)