It's 2 3/8 drill stem and 3/4 sucker rod. we have sanded and used a rust converter OSPHO on it and started using Valspar Oil Base Red Oxide Primer for Metal. my question is do I need to paint over the primer ? or can I just use the primer ? since I was gonna paint it Red, and the primer is Red . I have around 2500 ft to do so I don't want to spend anymore time on it than I need to. thanks