Dry Rot can develop in tires due to inactivity, excessive temperature fluctuations and UV rays from the sun. This is more the case with spare tires (those fitted on the outside) in 4x4s. Initially developing as small cracks on the side walls, these will eventually work their way to the tread, making the tire pretty useless and unsafe.
Dry rot can also develop in plastic, pvc or rubber based accessories fitted to the outside of your vehicle.
In this vlog I talk about how I protect against dry rot by regularly rotating my tires and also spraying my spare tire and accessories with a tire shine that has UV protection.
There are two different types of tire shines in the market. Those with UV protection as well as those without. It is more value to get one with UV protection. My choice has been from Turtle Wax, however there are other brands that offer the same shine and protection.