heh, you might have wanted to get another gun just for the primer! primer is notorious for fucking up good guns. and one more thing, if you have trouble with that primer, try Painters Pride, that's what i used, flowed smooth, and was nice, i got the non-sanding kind so what i did was shot primer, waited an hour then shot the car.
i would have used normal primer (sanding) but i was really pressed for time.