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I'm painting an iron structure to save it from corrosion and make it look nice. I was advised to apply a layer of primer which I did, it contains iron oxide and is supposed to prevent oxidation. Now I find that the primer itself is not very good in holding on to the iron. It can be easily scraped off with a light use of emery paper. If the layer beneath the paint is this weak how can I expect the paint to hold on and stay put on the metal. Could anyone experienced in this area please advise me. When painting how does the layer of primer feel after application and how does the paint applied with the primer work. Thanks a million.

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How well did you clean the surface before priming, were you all the way down to the metal, and does the primer say it's designed for metal? –  BMitch Oct 28 '13 at 11:28
    
also. if your fence is galvanized, you will find the paint easy to flake off (galvanizing needs different priming) ... –  Hightower Oct 28 '13 at 20:35
    
The red oxide primer is quite easy to flake off in my opinion (i specifically paint raw steel which still has some of the oil on it, hence it comes off easily, HOWEVER -- if you apply a good enamel over the primer, the enamel will bond properly. –  Hightower Oct 28 '13 at 20:37
    
Thanks Hightower, I hope when I apply the enamel paint it creates the same strong bond that you are referring to. –  MikePainter Oct 29 '13 at 5:54

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