Painting headers?

First of all, I CAN'T AFFORD TO SEND THEM TO GET COATED!!!! So don't tell me to coat them.

Now these headers already have a ceramic coating but it is a real crappy one and is rusting already. They have been on the car for under a year. do you think I can get the remaining coating off in the blasting cabinet?

How can I get the paint to last? Do I need high temp primer in addition to paint? I'm thinking yes. What paints are good? I have almost a full can of plastikote 1300 degree silver header paint.