Join Date: May 2014
Location: San Andreas Fault Zone
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Re: Do I need anything more than self etching primer to paint over powder coating?
No, the self-etching primer ONLY works on bare metal. The chemical "etching" component will have absolutely zero effect on cured powdercoat paint, which is actually plastic powder that had been sprayed on the part, then heated to melt it and "cure" it.
You will not be successful is getting ANY paint to adhere well to a powdercoated surface; think about the level of success you'd have painting a teflon-coated frying pan.
A very thorough and uniform sanding will help a tiny bit, and a thorough overall sandblasting would be a tiny bit better, but you'll never get adhesion as good as stripping down to bare metal by sandblasting, priming, and then applying multiple coats of wet paint.