I have a 72 vette that I painted base coat clear coat Millie Magilla red. The paint job came our real well but the paint never seemed to get really hard. If I am even wiping it down and rub accross the fender edge with my pants, there will be light scratches that I have to rub out. Someone told me that I might not have waited long enough between clear coats. Is there anything that can be done for this? The car cleans up real nice, but harder paint would be more durable and easier to keep shiny.