Master cylinder....paint or powdercoat?

I need to do something with my master cylinder. Just hung it on last week and its already getting surface rust on it. I know paint generally does not hold up around brake fluid. Will 2K urethane hold up?
Anyone here powdercoat a master cylinder?


Since I'm redoing my braking system completely lines, master cylinder calipers and all hoses. I went another route . pure synthetic that's not supposed to eat paint if spilled non hygroscopic and higher boiling temp. I does not mix with regular brake fluid though. We'll see, I just clear coated my master cylinder .... and yeah I spilled a bit on the darn casting %#$.