I've been ceramic coating wheels, exhaust tips and suspension components for years, including polished, raw and anodised finishes.
It keeps them clean for longer, and then makes them a breeze to clean when you come to it. Never a single issue or negative thing to say about it, no cracking or anything that you asked about.
I've personally always used "Carbon Collective - Platinum Wheels" but other big brands offer the same sort of thing such as Gyeon Rim, Gtechniq C5 etc.
Highly recommended, lasts many months, and in my experience well over a year.
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