Most aircraft paints are solid colour 2k polyurethane, not always or even often buffed and even less common to clearcoat, I've only seen clear on some homebuilts to be honest.
The paint is mainly there for corrosion protection, if it looks nice too I guess that's a bonus.
I think Sherwin Williams Jetglo has a good reputation as does Imron AF 400 and PPG stuff, they're not cheap around $100/litre for colour alone, the leftover fully cured stuff I've seen has consistency like a rubber ball.