Preventing UV damage to tire sidewalls?
My commuter bike is locked to a rack in direct sunlight all day long. I've noticed what seems to be pretty rapid UV damage to the sidewalls of the tires -- drying and cracking of the rubber. This is happening faster than the tread is wearing.
And so my question: with my next set of commuter tires, does it make sense to apply a UV protectorant, such as 303 Aerospace or Armor All, to the sidewalls (not the treads!)? Anyone else do this? Any drawbacks or safety concerns?