Por-15

Yes you can. I have done a few small spots of surface rust on my van and put POR15 over the bare metal. I let it dry overnight and scuffed and primed and painted it with no problems. Also POR 15 makes primer that is made for painting over POR 15. I bought some to paint the bottom of my car that is already has POR15 on it buy haven't had time to paint it yet so I don't know how good it works yet. I just know if you use regular epoxy primer make sure you scuff it so it is really dull before priming.