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I considered coating them myself. I'm building a cabin and it sucks up all of my time. The truck needs brakes but I don't have an extra day to paint the rotors.Why not just buy some of the higher quality Raybestos rotors or other brand of your choice and coat them with a high temperature paint yourself? I have used two sets of Raybestos rotors on my current Ranger with over 300K miles on it. They were not coated and have held up well. If you apply good quality paint and prep the rotors well, the paint should be durable.
I have coated drum brakes before with high temperature paint and they are still in good condition.
I'm an engineer who spent years approving aftermarket airplane parts for use in the US. So, yes, I'm aware that there are various quality auto parts. On a brake rotor its tough to tell quality by looking at it. You can look the specs and compare the tolerances. Super tight tolerances are not necessarily needed though. Corrosion is directly related to carbon content and alloying elements in the metal - that info isn't easily found. Price isn't always a good indicator either. The best bet is asking other people what they bought and had good service from.I like Bendix from Rockauto
Keep in mind parts stores sell several different grades of rotors too.