I search for this but could find where it had been discussed before.

Please tell me about the protective coating on condensers units (and by this I also mean the outside HP unit). What does it protect the coil fins from? Most important what, if any, harm is cause when it is removed with coil cleaner?

This has occurred a couple of times under the watchful eyes of HOs. I tell them it runs better without the paint coating on it. What is the truth?