Alright.
I asked the question on several forums and on Facebook. The one that made the most sense came from a friend who said that 24 hours drying on my Duplicolor red was not enough. I need more like four or five days.
Based on RYNO666's, (405th) link to the Rustoleum option he provide me yesterday, (thanks RYNO) I made contact with an Australian distributor in Victoria and spoke with one of their paint technicians.
He has basically confirmed what my friend has said.
The Duplicolor is a enamel paint, and apparently the solvents in enamels take a very long time to disperse, unlike acrylics or 2-packs.
His advice is to try again, give it four or five days to cure - the longer the better. Then when applying the clear coat over the top, give a very light spray first, wait for it to go off, then apply two normal coats with 15 to 20 minutes between coats.