Hey
Can anyone give me feed back on how to make the rust texture look more realistic
What the hell, did’t I already reply to this thread with several others? 
so to be brief this time:
- for now, stick with textures (find some seamless)
- rust needs gloss as well
- plugging generated texture coordinates as a factor to mix node seems wrong, you are probably missing a noise texture there
- use color ramps and combine noise textures of several sizes to achieve better details.
- study this http://www.blendswap.com/blends/view/44281 or this https://www.blenderguru.com/tutorials/how-to-make-rust/
I am not sure how to help you more, I would completely redo your whole setup, therefore I think it is best if you study some of those links I sent you, make something out of those techniques and perhaps then post your result and we can think about it further.
everything has fresnel!!
everything has fresnel!!
Indeed! Another very usefull link: