Painting Galvanized Pipe

[RussJeep1]

I made a roof rack for my JL out of galvanized structural pipe and fixtures.

http://www.steel-tek.com/

I'm not hear to brag about or bump it, but if you need visual, its first incarnation is here, before I'd lose 20% of the paint with each removal and installation: https://www.jlwranglerforums.com/forum/threads/diy-no-hole-roof-rails.10580/

What I need help with is how to make it black in color.

I considered Powder Coating but several of my local vendors have 5' limitations on any piece. Plus: well..it's not the cheapest route (but that's ancillary.)

As seen, I tried painting it, without treatment, and as said, it's been just too prone to chipping.

I've read about prepping the surface by stripping it of oils, sanding it, and then priming and painting it, but spray or brush paint, or maybe bed liner, or even flex seal, or epoxy paint, or something else--or maybe another prep method?

What's the best way to make it as close as possible to the resilience of power coating in a DIY way that won't break the bank?

Thanks.

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[Jeepsk8]

Bed liner is probably the most resilient coating. Prep is of the utmost importance otherwise it just won't adhere properly.