Just tried Krylon UV-Resistant Acrylic Clear Matte on my RG Freedom. I was expecting a lot worse! Some areas where laid on thick but that's from my own bad spraying pattern. :
Krylon K01305 Gallery Series Artist and Clear Coatings Aerosol, 11-Ounce, UV-Res | eBay
UV Resistant Clear Gloss or Matte Waterproofing Agent – mcgpaper