A couple of weeks ago, I wiped down some of my faded CF bits with Penetrol (mfg by Flood). It's supposed to restore dulled fiberglass among other claims. It really brought back the gloss and depth to the CF! No other prep involved.
You can usually find it in marine supply stores. I've had a quart can laying around the shop for years from when boatbuilding was my main hobby.
(Fishing) rod varnish may be another good choice - it's flexible, flows out evenly, clear, high gloss and durable. I just haven't gotten around to trying it out yet.