One of my oldest AI sails is cracking and ripping in the mono-film (clear) area. While looking for replacement material, my wife Dale came across this web page talking about the benefits of using 303 on sails. They recommend using it on the whole sail every 30-45 days that the sail is used (outings?) to protect it.
http://www.303products.com/shop303/index.cfm/category/143/303-products-on-sail-cloth.cfm
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http://KayakingBob.com - - - - - - - - - - - - - - - - - - - - - - - - - - - 2007, 2009 & 2010 Hobie AIs and a 2010 TI