When I did mine, I used the same paint that I used on all of my suspension parts and that was Eastwood rust encapsulator (as a primer) and Eastwood Extreme Chassis Black as a top coat. Came out great and I have not noticed any flaws in the paint from flexing or any other movement that may take place with that part.
Although I was very satisfied with the result, if I had to do it over again I would have it (and all of my suspension parts) power coated as I believe this will ultimately hold up better than paint in the long run.
Hope this helps.
Mike.
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