How (and why) did you get a comptip in New Zealand?
Anyway, I don't think it is anything to worry about. We have Hobie Waves that have endured the South Florida sun for more than 10 years without any kind of covering, and the comptips have shown no ill effects -- well, except for the one that Rick dropped on a concrete dock. <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />