Carbon rims - worn brake track?

[Permon]

Hi,

I do have Campagnolo Hyperon ultras wheels. I love those ones. I have been using them for more than 5 years. Today I was cleaning them and found out that the clear coat is missing on the braking track. Well, maybe it has been missing for years, I do not know....
Does it mean that wheels are to be replaced?

Actually, how do I recognize worn brake track on a carbon rim?
Is there a way I could put a new clear coat on? A high temperature resistant one?

Thanx for replies.

[eric]

Same way you recognize it on aluminium rims. Put a straight edge across the brake track and measure how much it is worn.

http://pardo.net/bike/pic/fail-026/000.html

[Permon]

Same way you recognize it on aluminium rims. Put a straight edge across the brake track and measure how much it is worn.

http://pardo.net/bike/pic/fail-026/000.html" onclick="window.open(this.href);return false;

It looks like my rims are like new:-) No curve, completelly straight.
Thanx.