UV light and Ozone eats rubber away and dry rots it, something you have plenty of in the hot desert.
I've always used Armour all on the rubber boots, once or twice a hear, its protects against the Ozone and UV, as well as moistures and lubricates the rubber.
If they don't sell Armour All in your part of the world, look for the spray protectant, that makes your tires look black and shiney, the stuff that says its a silicon product to protect rubber and vinyl from heat, UV light and ozone.
AFA, bushings/isolators wearing out to soon, rough conditions, like driving off-road will tear or damage them. A trick that I, and many others, have done with sporty FWD (lateral transaxle) vehicles, since hard driving often does the same thing to their motor/trans/transaxle mounts; we fill the voids in the bushings/isolator with windshield urethane, the stuff used to seal new windshields when they are replaced. Its a very durable rubber/urethane. Filling those voids with a suitable material will toughen up the bushing/isolator and actual improve performance because they will deflect less while being used under stressful situations.
Of course it has drawbacks, since you've firmed up and toughened up the bushing/isolator signficantly, it will transfer more noise/vibration/harshness (NVH) through the vehicle and damp it less. Most of the time its only a minor difference, but if you want that just off the dealer lot manners and smoothness, this is NOT for you.
Last edited by Mongo; 01-24-2011 at 12:31 PM.