I would assume you are referring to the centerboards.
I've never heard of clysar, but the fabric that is used should be irrelavent. An epoxy is used to fill and stiffen the fabric, but it is usually coated with a clearcoat for UV stability.
However, if we are talking Americas Cup boats, then who the heck knows what kind of fancy stuff they have for coatings.
In fact, I wouldn't be surprised if they don't even UV stabilize the carbon fiber and epoxy to save weight.
Look at what happened to the Aussie's in 1995.
I would love to see the end result of the project. It should be a lot of fun.
Too bad they wrecked the Cup with cats. No more close racing.