Duplicolor or Summit paint?

Low cost paint will not hold up well over time. In my auto body class the teacher showed the class why he never uses cheap paint. He painted a fender with the low cost shopline ppg base coat clear system and another with dbc 2000 the good expesive stuff and let it cure for a week. He took a razor blade to a corner of the panel painted with the shopline brand and peeled up large strips of paint off of the fender like peeling an orange. He couldnt do it with the panel painted with dbc. I would not paint my mopar with cheap paint if i planned on keeping it. Some things are worth paying for.