My Headsail UV Protection the same
Mike, our 2004 boat came from the factory with Doyle sails. The headsail is similar to yours in that the UV seems built-in to the white cloth. I had a sailmaker look at it. He said that the UV protection will be fine, and that the threading will deteriorate first from UV, as is apparently common with all sails. Since we also have issues with air-borne contaminants (airplane soot and general urban smog fallout), I had them build a sock from sunbrella that fits over the furled sail. We raise it with the spinnaker halyard. It cost around $200 bucks, and should help prolong sail replacement.