I'm not a paint expert, But the little I know is the catalyzed paint is very durable. I also think you should be using a better level of respiratory protection using it. You have to mix paint all the time with it, even doing small parts and touch ups. With the enamel you can get it in spray cans and quickly do the small parts and touch ups.
I am using TM9 paint and Paul has been a great help when I have questions.
Gary