Some paint questions for the guys who know paint

no no no ...I didnt mean eggshell in texture or shine I meant in strength....enamel hardens up nice is what I meant,where as the urethane always has somewhat of a softness to it....the color I am going with is plum crazy purple and it doesnt have alot of metallic to it...not like metal flake or anything,just a little fine grains of metallic. I don't think there should be any problems wet sanding it and buffing it. I just wanted to see everyones opinions on it. back in the day cars were painted with single stage all the time and they shined up great...all depends on how well the job was. by the way good job on that jeep...looks pretty tough.