I've done it Bob. On my Torino, I filled the Polyspan with dope, then used Duplicolor primer over it. I then used Duplicolor in spray cans for the base and trim colors. After that, I clear coated with dope.
One thing I found was that there is some sort of reaction, but not serious. For about a month afterwards, the finish seemed like it was orange peeled. It has laid down,, and looks good now.
I am tempted to wonder if it would not have happened if I'd let the dope gas off more, instead of trying to rush the finish.
Here's a few pics