Took me 6 years to stop putting rotor grease on the friction surface

Back when I first started turning wrenches at a small shop in Tacoma, an old timer told me to always grease the rotors so they wouldn't rust to the hub. I did that faithfully, slathering a thin coat all over the rotor face before every brake job. Last spring I pulled a wheel off a customer's F-150 and the pads were glazed so bad they looked like glass. The pedal pulsed and the truck shook at 45 mph. I asked the parts guy about it and he just stared at me and said "you grease the rotor face?" That's when it clicked. I had been contaminating every brake job I did for years because I misunderstood a basic tip about the hub centering ring. Nobody ever told me the difference. Now I only put a tiny bit of anti-seize on the hub pilot and nothing else. How many of you have had a similar "oh no" moment where a habit you picked up early turned out to be flat out wrong? What finally tipped you off?

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