I have a 2010 Sportsman 550 and my dad has a 1999 Xplorer 400. Both of them have composite racks/boxes on them. They both spent a few seasons in the sunshine. Now if bare skin touches the racks or storage boxes you will itch for hours like if you were crawling around in your fiberglass insulated attic. I have tried sanding, steel wool, and turpentine and the problem quickly returns. I've only found a couple of threads on the internet talking about this. Well meaning folk giving advice, but nobody with a story of "I had the problem. I did this. It fixed it." Anybody with real world experience to give advice? If not, my next attempt will be truck bed liner paint--which I'd prefer to avoid if there are other options.