Clearcoat wont work for a number of reasons.
1. A polished surface offers little adhesion.
2. A chip will allow moisture to creep in and turn the surrounding area milky in colour.
The best thing to do, as mentioned above, is to just polish regularly. I stripped and polished my Orange 5 a few weeks ago, mostly because the powder coat was awful and i was very bored. It looks great but needs constant attention.
The wet weather has made keeping it clean a right pain. I've given up now, going to get it powder coated by Argos cycles at the end of the summer.
Would load a photo up buy Flickr is being weird!