Bimmian's stance is in a way somewhat right.
Yes, CF epoxy chips easily, but it depends on the quality of the epoxy as well. There are different strength grades of epoxy resin. A good epoxy resin (e.g. structural Sika epoxy) would be able to handle weathering and impact much better than a cheap epoxy resin.
Of course, using structural epoxy for a mirror cover might be overkill. Structural CF epoxy (e.g. Sikadur 30) is the kind of epoxy you'd use for bridge deck repairs to bond CF to concrete. Your grills and mirror covers are a cosmetic part and if they were to use such a high strength epoxy, the price would be a lot more.
In my opinion, it's probably cheaper for you to buy a new replacement set as opposed to fixing them yourself with epoxy and trying to sand/polish it down.
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